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README.md

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+---
+license: apache-2.0
+language:
+- en
+base_model:
+- openai/clip-vit-large-patch14-336
+- allenai/OLMo-7B-1124
+pipeline_tag: image-text-to-text
+tags:
+  - multimodal
+  - olmo
+  - molmo
+  - pixmo
+library_name: transformers
+---
+
+<img src="molmo_logo.png" alt="Logo for the Molmo Project" style="width: auto; height: 50px;">
+
+# Molmo 7B-O
+
+Molmo is a family of open vision-language models developed by the Allen Institute for AI. 
+Molmo models are trained on PixMo, a dataset of 1 million, highly-curated image-text pairs. 
+It has state-of-the-art performance among multimodal models with a similar size while being fully open-source. 
+You can find all models in the Molmo family [here](https://huggingface.co/collections/allenai/molmo-66f379e6fe3b8ef090a8ca19).
+**Learn more** about the Molmo family [in our announcement blog post](https://molmo.allenai.org/blog) or the [paper](https://huggingface.co/papers/2409.17146).
+
+Molmo 7B-O is based on [OLMo-7B-1024](https://huggingface.co/allenai/OLMo-7B-1024-preview) (a **preview** of next generation of OLMo models) 
+and uses [OpenAI CLIP](https://huggingface.co/openai/clip-vit-large-patch14-336) as vision backbone.
+It performs comfortably between GPT-4V and GPT-4o on both academic benchmarks and human evaluation.
+
+This checkpoint is a **preview** of the Molmo release. All artifacts used in creating Molmo (PixMo dataset, training code, evaluations, intermediate checkpoints) will be made available at a later date, furthering our commitment to open-source AI development and reproducibility.
+
+[**Sign up here**](https://docs.google.com/forms/d/e/1FAIpQLSdML1MhNNBDsCHpgWG65Oydg2SjZzVasyqlP08nBrWjZp_c7A/viewform) to be the first to know when artifacts are released.
+
+
+Quick links:
+- 💬 [Demo](https://molmo.allenai.org/)
+- 📂 [All Models](https://huggingface.co/collections/allenai/molmo-66f379e6fe3b8ef090a8ca19)
+- 📃 [Paper](https://molmo.allenai.org/paper.pdf)
+- 🎥 [Blog with Videos](https://molmo.allenai.org/blog)
+
+## Quick Start
+
+To run Molmo, first install dependencies:
+
+```bash
+pip install einops torchvision
+```
+
+Then, follow these steps:
+
+```python
+from transformers import AutoModelForCausalLM, AutoProcessor, GenerationConfig
+from PIL import Image
+import requests
+
+# load the processor
+processor = AutoProcessor.from_pretrained(
+    'allenai/Molmo-7B-O-0924',
+    trust_remote_code=True,
+    torch_dtype='auto',
+    device_map='auto'
+)
+
+# load the model
+model = AutoModelForCausalLM.from_pretrained(
+    'allenai/Molmo-7B-O-0924',
+    trust_remote_code=True,
+    torch_dtype='auto',
+    device_map='auto'
+)
+
+# process the image and text
+inputs = processor.process(
+    images=[Image.open(requests.get("https://picsum.photos/id/237/536/354", stream=True).raw)],
+    text="Describe this image."
+)
+
+# move inputs to the correct device and make a batch of size 1
+inputs = {k: v.to(model.device).unsqueeze(0) for k, v in inputs.items()}
+
+# generate output; maximum 200 new tokens; stop generation when <|endoftext|> is generated
+output = model.generate_from_batch(
+    inputs,
+    GenerationConfig(max_new_tokens=200, stop_strings="<|endoftext|>"),
+    tokenizer=processor.tokenizer
+)
+
+# only get generated tokens; decode them to text
+generated_tokens = output[0,inputs['input_ids'].size(1):]
+generated_text = processor.tokenizer.decode(generated_tokens, skip_special_tokens=True)
+
+# print the generated text
+print(generated_text)
+
+# >>> This photograph captures an adorable black Labrador puppy sitting on a weathered
+#     wooden deck. The deck's planks, which are a mix of light and dark brown with ...
+```
+
+To make inference more efficient, run with autocast:
+
+```python
+with torch.autocast(device_type="cuda", enabled=True, dtype=torch.bfloat16):
+  output = model.generate_from_batch(
+      inputs,
+      GenerationConfig(max_new_tokens=200, stop_strings="<|endoftext|>"),
+      tokenizer=processor.tokenizer
+  )
+```
+
+We did most of our evaluations in this setting (autocast on, but float32 weights)
+
+To even further reduce the memory requirements, the model can be run with bfloat16 weights:
+
+```python
+model.to(dtype=torch.bfloat16)
+inputs["images"] = inputs["images"].to(torch.bfloat16)
+output = model.generate_from_batch(
+    inputs,
+    GenerationConfig(max_new_tokens=200, stop_strings="<|endoftext|>"),
+    tokenizer=processor.tokenizer
+)
+```
+
+Note that this can sometimes change the output of the model compared to running with float32 weights.
+
+## vLLM
+Molmo is supported in vLLM, however please use version <=0.7.2 until a [prepreprocessing bug](https://github.com/vllm-project/vllm/issues/26451) is fixed.
+
+
+## Evaluations
+
+| Model                       | Average Score on 11 Academic Benchmarks | Human Preference Elo Rating |
+|-----------------------------|-----------------------------------------|-----------------------------|
+| Molmo 72B                   | 81.2                                    | 1077                        |
+| Molmo 7B-D                  | 77.3                                    | 1056                        |
+| **Molmo 7B-O (this model)** | **74.6**                                | **1051**                    |
+| MolmoE 1B                   | 68.6                                    | 1032                        |
+| GPT-4o                      | 78.5                                    | 1079                        |
+| GPT-4V                      | 71.1                                    | 1041                        |
+| Gemini 1.5 Pro              | 78.3                                    | 1074                        |
+| Gemini 1.5 Flash            | 75.1                                    | 1054                        |
+| Claude 3.5 Sonnet           | 76.7                                    | 1069                        |
+| Claude 3 Opus               | 66.4                                    |  971                        |
+| Claude 3 Haiku              | 65.3                                    |  999                        |
+| Qwen VL2 72B                | 79.4                                    | 1037                        |
+| Qwen VL2 7B                 | 73.7                                    | 1025                        |
+| Intern VL2 LLAMA 76B        | 77.1                                    | 1018                        |
+| Intern VL2 8B               | 69.4                                    |  953                        |
+| Pixtral 12B                 | 69.5                                    | 1016                        |
+| Phi3.5-Vision 4B            | 59.7                                    |  982                        |
+| PaliGemma 3B                | 50.0                                    |  937                        |
+| LLAVA OneVision 72B         | 76.6                                    | 1051                        |
+| LLAVA OneVision 7B          | 72.0                                    | 1024                        |
+| Cambrian-1 34B              | 66.8                                    |  953                        |
+| Cambrian-1 8B               | 63.4                                    |  952                        |
+| xGen - MM - Interleave 4B   | 59.5                                    |  979                        |
+| LLAVA-1.5 13B               | 43.9                                    |  960                        |
+| LLAVA-1.5 7B                | 40.7                                    |  951                        |
+
+*Benchmarks: AI2D test, ChartQA test, VQA v2.0 test, DocQA test, InfographicVQA test, TextVQA val, RealWorldQA, MMMU val, MathVista testmini, CountBenchQA, Flickr Count (we collected this new dataset that is significantly harder than CountBenchQA).*
+
+## FAQs
+
+
+### I'm getting an error a broadcast error when processing images!
+
+Your image might not be in RGB format. You can convert it using the following code snippet:
+
+```python
+from PIL import Image
+
+image = Image.open(...)
+
+if image.mode != "RGB":
+    image = image.convert("RGB")
+```
+
+### Molmo doesn't work great with transparent images!
+
+We received reports that Molmo models might struggle with transparent images. 
+For the time being, we recommend adding a white or dark background to your images before passing them to the model. The code snippet below shows how to do this using the Python Imaging Library (PIL):
+
+```python
+
+# Load the image
+url = "..."
+image = Image.open(requests.get(url, stream=True).raw)
+
+# Convert the image to grayscale to calculate brightness
+gray_image = image.convert('L')  # Convert to grayscale
+
+# Calculate the average brightness
+stat = ImageStat.Stat(gray_image)
+average_brightness = stat.mean[0]  # Get the average value
+
+# Define background color based on brightness (threshold can be adjusted)
+bg_color = (0, 0, 0) if average_brightness > 127 else (255, 255, 255)
+
+# Create a new image with the same size as the original, filled with the background color
+new_image = Image.new('RGB', image.size, bg_color)
+
+# Paste the original image on top of the background (use image as a mask if needed)
+new_image.paste(image, (0, 0), image if image.mode == 'RGBA' else None)
+
+# Now you can pass the new_image to Molmo
+processor = AutoProcessor.from_pretrained(
+    'allenai/Molmo-7B-D-0924',
+    trust_remote_code=True,
+    torch_dtype='auto',
+    device_map='auto'
+)
+```
+
+
+## License and Use
+
+This model is licensed under Apache 2.0. It is intended for research and educational use.
+For more information, please see our [Responsible Use Guidelines](https://allenai.org/responsible-use).

added_tokens.json

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+{
+  "<im_col>": 100281,
+  "<im_end>": 100279,
+  "<im_patch>": 100280,
+  "<im_start>": 100278,
+  "<|image|>": 100282
+}

config.json

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+{
+  "architectures": [
+    "MolmoForCausalLM"
+  ],
+  "attention_layer_norm": true,
+  "auto_map": {
+    "AutoConfig": "config_molmo.MolmoConfig",
+    "AutoModelForCausalLM": "modeling_molmo.MolmoForCausalLM"
+  },
+  "clip_qkv": null,
+  "dtype": "float32",
+  "embedding_size": 100352,
+  "hidden_size": 4096,
+  "initializer_range": 0.02,
+  "intermediate_size": 22016,
+  "layer_norm_eps": 1e-06,
+  "layer_norm_type": "rms",
+  "max_position_embeddings": 4096,
+  "model_type": "molmo",
+  "norm_after": true,
+  "num_attention_heads": 32,
+  "num_hidden_layers": 32,
+  "num_key_value_heads": null,
+  "qkv_bias": false,
+  "quantization_config": {
+    "add_skip_keys": false,
+    "dequantize_fp32": false,
+    "group_size": 0,
+    "is_integer": true,
+    "modules_dtype_dict": {},
+    "modules_to_not_convert": [],
+    "non_blocking": false,
+    "quant_conv": false,
+    "quant_method": "sdnq",
+    "quantization_device": null,
+    "return_device": null,
+    "svd_rank": 32,
+    "svd_steps": 8,
+    "use_quantized_matmul": false,
+    "use_quantized_matmul_conv": false,
+    "use_svd": false,
+    "weights_dtype": "int8"
+  },
+  "rope_theta": 500000.0,
+  "tie_word_embeddings": false,
+  "transformers_version": "4.57.1",
+  "use_cache": true,
+  "use_position_ids": true,
+  "vocab_size": 100278,
+  "weight_tying": false
+}

config_molmo.py

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+from typing import List
+
+from transformers import PretrainedConfig, AutoTokenizer
+
+
+class MolmoConfig(PretrainedConfig):
+    model_type = "molmo"
+    keys_to_ignore_at_inference = ["past_key_values"]
+
+    def __init__(
+        self,
+        vocab_size=50304,
+        embedding_size=50304,
+        hidden_size=4096,
+        intermediate_size=11008,
+        num_hidden_layers=32,
+        num_attention_heads=32,
+        num_key_value_heads=None,
+        max_position_embeddings=2048,
+        initializer_range=0.02,
+        use_cache=True,
+        layer_norm_eps: float = 1e-5,
+        rope_theta=10000.0,
+        clip_qkv=None,
+        qkv_bias: bool = False,
+        weight_tying: bool = False,
+        use_position_ids: bool=True,
+        tie_word_embeddings: bool=True,
+        attention_layer_norm: bool=False,
+        norm_after: bool = False,
+        layer_norm_type: str="rms",
+        **kwargs,
+    ):
+        self.vocab_size = vocab_size
+        self.embedding_size = embedding_size
+        self.max_position_embeddings = max_position_embeddings
+        self.hidden_size = hidden_size
+        self.intermediate_size = intermediate_size
+        self.num_hidden_layers = num_hidden_layers
+        self.num_attention_heads = num_attention_heads
+        self.layer_norm_eps = layer_norm_eps
+        self.weight_tying = weight_tying
+        self.use_position_ids = use_position_ids
+        self.attention_layer_norm = attention_layer_norm
+        self.num_key_value_heads = num_key_value_heads
+        self.initializer_range = initializer_range
+        self.use_cache = use_cache
+        self.rope_theta = rope_theta
+        self.clip_qkv = clip_qkv
+        self.qkv_bias = qkv_bias
+        self.norm_after = norm_after
+        self.tie_word_embeddings = tie_word_embeddings
+        self.layer_norm_type = layer_norm_type
+
+        super().__init__(
+            tie_word_embeddings=tie_word_embeddings,
+            **kwargs,
+        )
+
+MolmoConfig.register_for_auto_class()

generation_config.json

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+{
+  "_from_model_config": true,
+  "transformers_version": "4.57.1"
+}

image_preprocessing_molmo.py

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+"""Image processor class for Molmo"""
+from typing import List, Optional, Union, Mapping
+
+import numpy as np
+import einops
+import torch
+import torchvision.transforms
+from torchvision.transforms import InterpolationMode
+from torchvision.transforms.functional import convert_image_dtype
+
+from transformers.image_utils import (
+    OPENAI_CLIP_MEAN,
+    OPENAI_CLIP_STD,
+    ImageInput,
+    is_valid_image,
+)
+from transformers.processing_utils import ImagesKwargs
+from transformers.image_processing_utils import BaseImageProcessor
+from transformers.utils import logging
+
+
+logger = logging.get_logger(__name__)
+
+
+def pad_to_bounding_box(
+    image, offset_height, offset_width, target_height,
+    target_width, value=0
+):
+    height, width = image.shape[:2]
+    after_padding_width = target_width - offset_width - width
+    after_padding_height = target_height - offset_height - height
+    return np.pad(image, [
+        [offset_height, after_padding_height],
+        [offset_width, after_padding_width],
+        [0, 0]
+    ], constant_values=value)
+
+
+def normalize_image(image, offset, scale):
+    image -= np.array(offset, dtype=np.float32)[None, None, :]
+    image /= np.array(scale, dtype=np.float32)[None, None, :]
+    return image
+
+
+def resize_and_pad(
+    image,
+    desired_output_size,
+    resize_method="torch-bilinear",
+    pad_value=0,
+    normalize=True,
+    image_mean=OPENAI_CLIP_MEAN,
+    image_std=OPENAI_CLIP_STD,
+):
+    desired_height, desired_width = desired_output_size
+    height, width = image.shape[:2]
+
+    # Cast into float32 since the training code did this in float32 and it (very rarely) effects
+    # the results after rounding.
+    image_scale_y = np.array(desired_height, np.float32) / np.array(height, np.float32)
+    image_scale_x = np.array(desired_width, np.float32) / np.array(width, np.float32)
+    image_scale = min(image_scale_x, image_scale_y)
+    scaled_height = int(np.array(height, np.float32) * image_scale)
+    scaled_width = int(np.array(width, np.float32) * image_scale)
+
+    if resize_method == "tensorflow":
+        # This how the original training code did resizing, it can produce slightly different
+        # results then using torch resize so we keep it just in case
+        import tensorflow as tf
+        image = tf.image.convert_image_dtype(tf.constant(image), dtype=tf.float32)
+        image = tf.image.resize(
+            image,
+            [scaled_height, scaled_width],
+            method=tf.image.ResizeMethod.BILINEAR,
+            antialias=True,
+        )
+        image = tf.clip_by_value(image, 0.0, 1.0)
+        image = image.numpy()
+    elif resize_method == "torch-bilinear":
+        image = torch.permute(torch.from_numpy(image), [2, 0, 1])
+        image = convert_image_dtype(image)  # resize in float32 to match the training code
+        image = torchvision.transforms.Resize(
+            [scaled_height, scaled_width], InterpolationMode.BILINEAR, antialias=True
+        )(image)
+        image = torch.clip(image, 0.0, 1.0)
+        image = torch.permute(image, [1, 2, 0]).numpy()
+    else:
+        raise NotImplementedError(resize_method)
+
+    top_pad = (desired_height - scaled_height) // 2
+    left_pad = (desired_width - scaled_width) // 2
+    padding = [
+        [top_pad, desired_height - scaled_height - top_pad],
+        [left_pad, desired_width - scaled_width - left_pad],
+        [0, 0]
+    ]
+    image_mask = np.pad(np.ones_like(image[:, :, 0], dtype=bool), padding[:2])
+    image = np.pad(image, padding, constant_values=pad_value)
+    if normalize:
+        image = normalize_image(image, offset=image_mean, scale=image_std)
+    return image, image_mask
+
+
+def select_tiling(h, w, patch_size, max_num_patches):
+    """Decide how best to divide in image of size [w, h] in up to max_num_patches of size patch_size"""
+    original_size = np.stack([h, w])  # [1, 2]
+    original_res = h * w
+    tilings = []
+    for i in range(1, max_num_patches+1):
+        for j in range(1, max_num_patches+1):
+            if i*j <= max_num_patches:
+                tilings.append((i, j))
+    # sort so argmin and argmax favour smaller tilings in the event of a tie
+    tilings.sort(key=lambda x: (x[0]*x[1], x[0]))
+    candidate_tilings = np.array(tilings, dtype=np.int32)  # [n_resolutions, 2]
+    candidate_resolutions = candidate_tilings * patch_size  # [n_resolutions, 2]
+
+    # How much we would need to scale the image to fit exactly in each tiling
+    original_size = np.stack([h, w], dtype=np.float32)  # [1, 2]
+    required_scale_d = candidate_resolutions.astype(np.float32) / original_size
+    required_scale = np.min(required_scale_d, axis=-1, keepdims=True)  # [n_resolutions, 1]
+    if np.all(required_scale < 1):
+        # We are forced to downscale, so try to minimize the amount of downscaling
+        ix = np.argmax(required_scale)
+    else:
+        # Pick the resolution that required the least upscaling so that it most closely fits the image
+        required_scale = np.where(required_scale < 1.0, 10e9, required_scale)
+        ix = np.argmin(required_scale)
+    return candidate_tilings[ix]
+
+
+class MolmoImagesKwargs(ImagesKwargs, total=False):
+    max_crops: Optional[int]
+    overlap_margins: Optional[List[int]]
+    base_image_input_size: Optional[List[int]]
+    image_token_length_w: Optional[int]
+    image_token_length_h: Optional[int]
+    image_patch_size: Optional[int]
+    image_padding_mask: Optional[bool]
+
+
+class MolmoImageProcessor(BaseImageProcessor):
+    """Preprocess images and multi-model inputs"""
+
+    def __init__(
+        self,
+        max_crops: int = 12,
+        overlap_margins: List[int] = (4, 4),
+        base_image_input_size: List[int] = (336, 336),
+        image_token_length_w: int = 12,
+        image_token_length_h: int = 12,
+        image_patch_size: int = 14,
+        image_padding_mask: bool = True,
+        do_normalize: bool = True,
+        image_mean: Optional[Union[float, List[float]]] = None,
+        image_std: Optional[Union[float, List[float]]] = None,
+        **kwargs,
+    ):
+        super().__init__(**kwargs)
+        self.max_crops = max_crops
+        self.overlap_margins = overlap_margins
+        self.base_image_input_size = base_image_input_size
+        self.image_token_length_w = image_token_length_w
+        self.image_token_length_h = image_token_length_h
+        self.image_patch_size = image_patch_size
+        self.image_padding_mask = image_padding_mask
+        self.do_normalize = do_normalize
+        self.image_mean = image_mean if image_mean is not None else OPENAI_CLIP_MEAN
+        self.image_std = image_std if image_std is not None else OPENAI_CLIP_STD
+
+    def image_to_patches_and_tokens(
+        self,
+        image: ImageInput,
+        image_patch_token_id: int,
+        image_col_token_id: int,
+        image_start_token_id: int,
+        image_end_token_id: int,
+        max_crops: Optional[int] = None,
+        overlap_margins: Optional[List[int]] = None,
+        base_image_input_size: Optional[Union[int, List[int]]] = None,
+        image_token_length_w: Optional[int] = None,
+        image_token_length_h: Optional[int] = None,
+        image_patch_size: Optional[int] = None,
+    ):
+        if isinstance(base_image_input_size, int):
+            base_image_input_size = (base_image_input_size, base_image_input_size)
+
+        base_image_input_d = image_patch_size
+        tokens_per_image = image_token_length_w * image_token_length_h
+        image_base_patch_w = base_image_input_size[1] // base_image_input_d
+        image_base_patch_h = base_image_input_size[0] // base_image_input_d
+
+        original_image_h, original_image_w = image.shape[:2]
+        crop_size = base_image_input_size[0]
+
+        # Discard this many patches from the (left/top, right/bottom) of crops
+        left_margin, right_margin = overlap_margins
+        # left_margin, right_margin = 2, 2
+        assert left_margin % 2 == 0  # Required for compatibility with 2x2 pooling
+        total_margin_pixels = base_image_input_d*(right_margin + left_margin)  # pixels removed per dim
+        crop_patches = base_image_input_size[0] // base_image_input_d  # patches per crop dim
+        crop_window_patches = crop_patches - (right_margin + left_margin)  # usable patches
+        crop_window_size = crop_window_patches * base_image_input_d
+        tiling = select_tiling(
+            original_image_h - total_margin_pixels,
+            original_image_w - total_margin_pixels,
+            crop_window_size,
+            max_crops
+        )
+        src, img_mask = resize_and_pad(
+            image,
+            [tiling[0]*crop_window_size+total_margin_pixels, tiling[1]*crop_window_size+total_margin_pixels]
+        )
+
+        # Now we have to split the image into crops, while keeping track of how each patch in the
+        # each crop should be ordered in the global image, this require a lot of tricky booking
+        n_crops = tiling[0] * tiling[1]
+        patches_arr = []
+        mask_arr = []
+        patch_ordering_arr = []
+
+        # We assume 2x2 pooling, but can allow padding the right/bottom with extra
+        # patches if the number of patches per side is not even
+        assert (crop_patches+1)//2 == image_token_length_h
+        assert (crop_patches+1)//2 == image_token_length_w
+        on = 0
+        on_patch = 0
+        for i in range(tiling[0]):
+            y0 = i*crop_window_size
+            if i == 0:
+                crop_y0 = 0
+            else:
+                crop_y0 = left_margin // 2
+
+            crop_h = image_base_patch_h - (right_margin + left_margin)
+            if i == 0:
+                crop_h += left_margin
+            if i == (tiling[0]-1):
+                crop_h += right_margin
+            for j in range(tiling[1]):
+                x0 = j*crop_window_size
+                if j == 0:
+                    crop_x0 = 0
+                else:
+                    crop_x0 = left_margin // 2
+
+                crop_w = image_base_patch_w - (right_margin + left_margin)
+                if j == 0:
+                    crop_w += left_margin
+                if j == (tiling[1]-1):
+                    crop_w += right_margin
+
+                pooled_w = (crop_w + 1) // 2
+                pooled_h = (crop_h + 1) // 2
+                patch_ordering_arr.append(
+                    pad_to_bounding_box(
+                        np.reshape(np.arange(on, on+pooled_h*pooled_w, dtype=np.int32), (pooled_h, pooled_w, 1)),
+                        crop_y0, crop_x0, image_token_length_h, image_token_length_w, value=-1
+                    )[:, :, 0]
+                )
+                patches_arr.append(src[y0:y0+crop_size, x0:x0+crop_size])
+                mask_arr.append(img_mask[y0:y0+crop_size, x0:x0+crop_size])
+
+                on += pooled_h*pooled_w
+                on_patch += 1
+        patches = np.stack(patches_arr)
+        patch_ordering = np.stack(patch_ordering_arr)
+        img_mask = np.stack(mask_arr)
+
+        # Switch to [n_crops, n_patches, pixels_per_patch] format
+        image_layout_impatch_w, image_layout_impatch_h = tiling[0], tiling[1]
+        patches = einops.rearrange(
+            patches, 'p (h dh) (w dw) c -> p (h w) (dh dw c)',
+            dh=base_image_input_d,
+            dw=base_image_input_d,
+            h=image_base_patch_h,
+            w=image_base_patch_w
+        )
+        img_mask = einops.rearrange(
+            img_mask, 'p (h dh) (w dw) -> p (h w) (dh dw)',
+            dh=base_image_input_d,
+            dw=base_image_input_d,
+            h=image_base_patch_h,
+            w=image_base_patch_w
+        )
+
+        img_mask = img_mask.astype(np.float32).mean(axis=-1)
+        patch_ordering = np.reshape(patch_ordering, [-1])
+        valid = patch_ordering >= 0
+
+        # Transpose order, to get left-to-right order instead of crop-by-crop order
+        patch_ordering_rh = np.reshape(
+            patch_ordering,
+            [tiling[0], tiling[1], image_token_length_h, image_token_length_w]
+        )
+        patch_ordering_rh = np.transpose(patch_ordering_rh, [0, 2, 1, 3])
+        patch_ordering_rh = np.reshape(patch_ordering_rh, [-1])
+
+        # The transpose will screw up which patches are masked, project the
+        # new order into sparse structure of `patch_ordering` to fix this
+        patch_ordering[valid] = patch_ordering_rh[patch_ordering_rh >= 0]
+
+        # Now build the output tokens
+        h = tiling[0] * crop_window_patches + (right_margin+left_margin)
+        w = tiling[1] * crop_window_patches + (right_margin+left_margin)
+        per_row = np.full(
+            ((w+1)//2,),
+            image_patch_token_id,
+        )
+        per_row = np.concatenate([per_row, [image_col_token_id]], 0)
+
+        joint = np.tile(per_row, [(h+1)//2])
+        joint = [
+            [image_start_token_id],
+            joint,
+            [image_end_token_id]
+        ]
+
+        # Finally do the same for the global image
+        resized, _ = resize_and_pad(image, base_image_input_size)
+        resized = einops.rearrange(
+            resized, '(h dh) (w dw) c -> (h w) (dh dw c)',
+            dh=base_image_input_d,
+            dw=base_image_input_d,
+            h=image_base_patch_h,
+            w=image_base_patch_w
+        )
+        patches = np.concatenate([np.expand_dims(resized, 0), patches], 0)
+
+        # Global image goes first, so the order of patches in previous crops gets increased
+        patch_ordering = np.where(
+            patch_ordering >= 0,
+            patch_ordering + tokens_per_image,
+            -1
+        )
+        patch_ordering = np.concatenate([np.arange(0, tokens_per_image), patch_ordering], 0)
+        per_row = np.full(
+            (image_token_length_w,),
+            image_patch_token_id,
+        )
+        per_row = np.concatenate([per_row, [image_col_token_id]], 0)
+        extra_tokens = np.tile(per_row, [image_token_length_h])
+        joint = [
+                    [image_start_token_id],
+                    extra_tokens,
+                    [image_end_token_id],
+                ] + joint
+
+        joint = np.concatenate(joint, 0)
+        img_mask = np.pad(img_mask, [[0, 1], [0, 0]], constant_values=-1)
+        return patches, joint, patch_ordering, img_mask
+
+    def build_image_input_idx(
+        self,
+        image_tokens: np.ndarray,
+        patch_order: np.ndarray,
+        image_patch_token_id: int,
+        no_image: Optional[bool] = None,
+        image_token_length_w: Optional[int] = None,
+        image_token_length_h: Optional[int] = None,
+    ):
+        """Converts `patch_order` into a mapping of token_id -> patch_id"""
+
+        tokens_per_image = image_token_length_w * image_token_length_h
+        if no_image is not None and no_image:
+            return np.zeros((0, tokens_per_image), np.int32)
+
+        # Indices to insert the patches
+        image_input_idx = image_tokens == image_patch_token_id
+        image_input_idx = np.nonzero(image_input_idx)[0].astype(np.int32)
+
+        if patch_order is not None:
+            n_tokens = image_input_idx.shape[0]
+            patch_order = np.reshape(patch_order, [-1])
+            n_patches = patch_order.shape[0]
+
+            valid = patch_order >= 0
+            n_valid_patches = valid.sum()
+            assert len(image_input_idx) == n_valid_patches
+
+            sorted_patch_ixs = np.zeros([n_tokens], np.int32)
+            sorted_patch_ixs[patch_order[valid]] = np.arange(n_valid_patches, dtype=np.int32)
+
+            # Project the inverted mapping into same sparse structure
+            sorted_patch_ixs_ex = np.full(np.shape(patch_order), -1)
+            sorted_patch_ixs_ex[valid] = sorted_patch_ixs
+
+            # Do the gather and then re-masked outputs that were masked in `sorted_patch_ixs`
+            valid = (sorted_patch_ixs_ex >= 0).astype(np.int32)
+            image_input_idx = image_input_idx[sorted_patch_ixs_ex*valid]
+            image_input_idx = image_input_idx*valid - 100*(1 - valid)
+            image_input_idx = np.reshape(image_input_idx, [-1, tokens_per_image])
+        return image_input_idx
+
+    def preprocess(
+        self,
+        image: np.ndarray,
+        image_patch_token_id: int,
+        image_col_token_id: int,
+        image_start_token_id: int,
+        image_end_token_id: int,
+        max_crops: Optional[int] = None,
+        overlap_margins: Optional[List[int]] = None,
+        base_image_input_size: Optional[Union[int, List[int]]] = None,
+        image_token_length_w: Optional[int] = None,
+        image_token_length_h: Optional[int] = None,
+        image_patch_size: Optional[int] = None,
+        **kwargs,
+    ):
+        """Preprocesses an image
+
+        Returns:
+            crops: (n_crops, n_patches, patch_dim) individual crops, `n_crops` might
+                   change between images but the other dimension are fixed
+            tokens: (n_tokens,) int32 tokens, pad tokens indicate where to insert the
+                                patch features, might include other special tokens as well
+            image_idx: (n_crops, n_patches) index in `tokens` to put the patch features from the
+                       crops after pooling, negative values indicates patches features to exclude
+            padding_mask: (n_crops, n_patches) what percent of each crop is padding, can be None
+                          if the image mask is not being used.
+        """
+
+        max_crops = max_crops or self.max_crops
+        overlap_margins = overlap_margins or self.overlap_margins
+        base_image_input_size = base_image_input_size or self.base_image_input_size
+        image_token_length_w = image_token_length_w or self.image_token_length_w
+        image_token_length_h = image_token_length_h or self.image_token_length_h
+        image_patch_size = image_patch_size or self.image_patch_size
+
+        crops, image_tokens, patch_ordering, img_mask = self.image_to_patches_and_tokens(
+            image,
+            image_patch_token_id,
+            image_col_token_id,
+            image_start_token_id,
+            image_end_token_id,
+            max_crops,
+            overlap_margins,
+            base_image_input_size,
+            image_token_length_w,
+            image_token_length_h,
+            image_patch_size,
+        )
+        patch_idx = self.build_image_input_idx(
+            image_tokens,
+            patch_ordering,
+            image_patch_token_id,
+            image_token_length_w=image_token_length_w,
+            image_token_length_h=image_token_length_h,
+        )
+        return crops, image_tokens, patch_idx, img_mask
+
+    def multimodal_preprocess(
+        self,
+        images: np.ndarray,
+        tokens: List[int],
+        image_idx: np.ndarray,
+        sequence_length: int,
+        image_patch_token_id: int,
+        image_col_token_id: int,
+        image_start_token_id: int,
+        image_end_token_id: int,
+        **kwargs,
+    ):
+        """Merge images and text tokens into multi-modal features for the model
+
+        :param images: images to use as input
+        :param tokens: input text tokens
+        :param image_idx: where to insert the images into `tokens`
+        :params image_patch_token_id: id to use of tokens that will contain image features
+        :params image_col_token_id: token id for image column special tokens
+        :params image_start_token_id: token id for image start special tokens
+        :params image_end_token_id: token id for image end special tokens
+        :params kwargs: override preprocessor default args
+        """
+        max_total_crops = kwargs.get("max_crops") or self.max_crops
+        image_token_length_w = kwargs.get("image_token_length_w") or self.image_token_length_w
+        image_token_length_h = kwargs.get("image_token_length_h") or self.image_token_length_h
+        image_patch_size = kwargs.get("image_patch_size") or self.image_patch_size
+        base_image_input_size = kwargs.get("base_image_input_size") or self.base_image_input_size
+        image_num_patch = (
+            base_image_input_size[0] // image_patch_size,
+            base_image_input_size[1] // image_patch_size,
+        )
+        image_padding_mask = kwargs.get("image_padding_mask") or self.image_padding_mask
+
+        tokens_per_image = image_token_length_w * image_token_length_h
+        n_pixels = image_patch_size * image_patch_size * 3
+        n_patches = image_num_patch[0] * image_num_patch[1]
+
+        if images is None:
+            return {
+                "input_ids": tokens,
+            }
+        else:
+            n = len(images)
+            all_crops = []
+            all_image_idx = []
+            out_tokens = []
+            all_crop_masks = []
+
+            for ix in range(n):
+                token_ix = image_idx[ix]
+                crops, image_tokens, patch_idx, img_mask = self.preprocess(
+                    images[ix],
+                    image_patch_token_id,
+                    image_col_token_id,
+                    image_start_token_id,
+                    image_end_token_id,
+                    **kwargs,
+                )
+
+                if token_ix == -1:  # -1 is an image inserted at the very start
+                    start = 0
+                    token_ix = 0
+                    end = 0
+                else:
+                    start = 0 if ix == 0 else image_idx[ix-1] + 1
+                    end = token_ix + 1
+
+                all_image_idx.append(patch_idx + token_ix)
+                all_crops.append(crops)
+                out_tokens.append(tokens[start:token_ix])
+                out_tokens.append(image_tokens)
+                if ix == (n - 1):
+                    out_tokens.append(tokens[end:])
+                if image_padding_mask:
+                    all_crop_masks.append(img_mask)
+
+            input_ids = np.concatenate(out_tokens, 0)
+            images = np.concatenate(all_crops, 0)
+            image_input_idx = np.concatenate(all_image_idx, 0)
+            if image_padding_mask:
+                image_masks = np.concatenate(all_crop_masks, 0)
+            else:
+                image_masks = None
+
+        out = {
+            "input_ids": input_ids,
+            "images": images,
+            "image_input_idx": image_input_idx
+        }
+        if image_masks is not None:
+            out["image_masks"] = image_masks
+        return out
+
+
+MolmoImageProcessor.register_for_auto_class()

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+  }
+}

modeling_molmo.py

@@ -0,0 +1,2372 @@
+import logging
+import math
+from copy import deepcopy
+from dataclasses import fields, dataclass, replace
+from enum import Enum
+from typing import List, Optional, Tuple, Union, Dict, Any, Sequence, Callable, cast, MutableMapping
+
+import torch
+from einops import einsum, einops
+from transformers import PreTrainedModel, GenerationConfig
+from transformers.cache_utils import Cache
+from transformers.modeling_outputs import CausalLMOutputWithPast, ModelOutput
+from transformers.models.auto import AutoModelForCausalLM
+from torch import nn
+
+from .config_molmo import MolmoConfig
+from torch.nn import functional as F
+
+
+log = logging.getLogger(__name__)
+
+
+class BufferCache(dict, MutableMapping[str, torch.Tensor]):
+    """
+    Cache for attention biases and other things that would normally be stored as buffers.
+    We avoid using buffers because we've run into various issues doing so with FSDP.
+    In general it appears the way FSDP handles buffers is not well-defined.
+    It doesn't shard them but apparently it does synchronize them across processes, which we want to avoid
+    since (A) it isn't necessary, and (B) we sometimes have `-inf` in these biases which might get turned into
+    NaNs when they're synchronized due to casting or some other issue.
+    """
+
+
+class StrEnum(str, Enum):
+    def __str__(self) -> str:
+        return self.value
+
+    def __repr__(self) -> str:
+        return f"'{str(self)}'"
+
+
+class ImageProjectType(StrEnum):
+    mlp = "mlp"
+    mlpx2 = "2mlp"
+    linear = "linear"
+
+
+class ImagePooling2DType(StrEnum):
+    attention = "attention"
+    attention_meanq = "attention-meanq"
+    attention_2wide = "attention_2wide"
+    attention_v2 = "attention-v2"
+    none = "none"
+    stack = "stack"
+
+
+class ActivationType(StrEnum):
+    quick_gelu = "quick_gelu"
+    gelu = "gelu"
+    gelu_tanh = "gelu_tanh"
+    relu = "relu"
+    silu = "silu"
+    llama_geglu = "llama_geglu"
+    llama_geglu_tanh = "llama_geglu_tanh"
+    llama_swiglu = "llama_swiglu"
+    swiglu = "swiglu"
+
+
+def ensure_finite_(x: torch.Tensor, check_neg_inf: bool = True, check_pos_inf: bool = False):
+    """
+    Modify ``x`` in place to replace ``float("-inf")`` with the minimum value of the dtype when ``check_neg_inf``
+    is ``True`` and to replace ``float("inf")`` with the maximum value of the dtype when ``check_pos_inf`` is ``True``.
+    """
+    if check_neg_inf:
+        x.masked_fill_(x == float("-inf"), torch.finfo(x.dtype).min)
+    if check_pos_inf:
+        x.masked_fill_(x == float("inf"), torch.finfo(x.dtype).max)
+
+
+class MolmoConfigurationError(Exception):
+    pass
+
+
+def _non_meta_init_device(config) -> torch.device:
+    if config.init_device is not None and config.init_device != "meta":
+        return torch.device(config.init_device)
+    else:
+        return torch.device("cuda" if torch.cuda.is_available() else "cpu")
+
+
+class RotaryEmbedding(nn.Module):
+    """
+    [Rotary positional embeddings (RoPE)](https://arxiv.org/abs/2104.09864).
+    """
+
+    def __init__(self, config: MolmoConfig, cache: BufferCache):
+        super().__init__()
+        self.config = config
+        self.__cache = cache
+        # Warm up cache.
+        self.get_rotary_embedding(
+            config.max_position_embeddings or config.max_sequence_length,
+            _non_meta_init_device(config)
+        )
+
+    def get_rotary_embedding(self, seq_len: int, device: torch.device) -> Tuple[torch.Tensor, torch.Tensor]:
+        if (
+            (pos_sin := self.__cache.get("rope_pos_sin")) is not None
+            and (pos_cos := self.__cache.get("rope_pos_cos")) is not None
+            and pos_sin.shape[-2] >= seq_len
+            and pos_cos.shape[-2] >= seq_len
+        ):
+            if pos_sin.device != device:
+                pos_sin = pos_sin.to(device)
+                self.__cache["rope_pos_sin"] = pos_sin
+            if pos_cos.device != device:
+                pos_cos = pos_cos.to(device)
+                self.__cache["rope_pos_cos"] = pos_cos
+            return pos_sin[:, :, :seq_len, :], pos_cos[:, :, :seq_len, :]
+
+        with torch.autocast(device.type, enabled=False):
+            dim = self.config.d_model // self.config.n_heads
+            inv_freq = 1.0 / (self.config.rope_theta ** (torch.arange(0, dim, 2, device=device, dtype=torch.float) / dim))
+            seq = torch.arange(seq_len, device=device, dtype=torch.float)
+            freqs = torch.einsum("i , j -> i j", seq, inv_freq)
+            if self.config.rope_impl == "interleave":
+                positions = freqs.repeat_interleave(2, dim=-1)
+            else:
+                positions = torch.cat((freqs, freqs), dim=-1)
+            pos_sin, pos_cos = positions.sin()[None, None, :, :], positions.cos()[None, None, :, :]
+        self.__cache["rope_pos_sin"] = pos_sin
+        self.__cache["rope_pos_cos"] = pos_cos
+        return pos_sin, pos_cos
+
+    def rotate_half(self, x: torch.Tensor) -> torch.Tensor:
+        B, nh, T, hs = x.size()
+        x = x.view(B, nh, T, 2, hs // 2)
+        x1, x2 = x.unbind(dim=-2)
+        return torch.cat((-x2, x1), dim=-1)
+
+    def rotate_every_two(self, x: torch.Tensor) -> torch.Tensor:
+        B, nh, T, hs = x.size()
+        x = x.view(B, nh, T, hs // 2, 2)
+        x1, x2 = x.unbind(dim=-1)
+        x = torch.stack((-x2, x1), dim=-1)
+        return x.view(B, nh, T, hs)
+
+    def apply_rotary_pos_emb(self, pos_sin: torch.Tensor, pos_cos: torch.Tensor, t: torch.Tensor) -> torch.Tensor:
+        if self.config.rope_impl == "interleave":
+            return ((t * pos_cos) + (self.rotate_every_two(t) * pos_sin)).to(t.dtype)
+        else:
+            return ((t * pos_cos) + (self.rotate_half(t) * pos_sin)).to(t.dtype)
+
+    def forward(
+        self,
+        q: torch.Tensor,
+        k: torch.Tensor,
+        position_ids: Optional[torch.Tensor] = None
+    ) -> Tuple[torch.Tensor, torch.Tensor]:
+        if self.config.rope_full_precision:
+            q_, k_ = q.float(), k.float()
+        else:
+            q_, k_ = q, k
+
+        with torch.autocast(q.device.type, enabled=False):
+            batch_size = q_.shape[0]
+            query_len, key_len = q_.shape[-2], k_.shape[-2]  # could be different if layer_past not None
+            if position_ids is not None:
+                freqs_cis_len = (self.config.max_position_embeddings or self.config.max_sequence_length)
+            else:
+                freqs_cis_len = key_len
+            pos_sin, pos_cos = self.get_rotary_embedding(freqs_cis_len, q_.device)
+            pos_sin = pos_sin.type_as(q_)
+            pos_cos = pos_cos.type_as(q_)
+            if position_ids is not None:
+                assert query_len == key_len, "Query and key lengths must be equal when using position IDs."
+                pos_sin = pos_sin[0, 0][position_ids].view(
+                    (batch_size, 1, key_len, pos_sin.shape[-1])
+                )
+                pos_cos = pos_cos[0, 0][position_ids].view(
+                    (batch_size, 1, key_len, pos_cos.shape[-1])
+                )
+            q_ = self.apply_rotary_pos_emb(
+                pos_sin[:, :, key_len - query_len : key_len, :],
+                pos_cos[:, :, key_len - query_len : key_len, :],
+                q_,
+            )
+            k_ = self.apply_rotary_pos_emb(pos_sin, pos_cos, k_)
+        return q_.type_as(q), k_.type_as(k)
+
+
+class MolmoBlock(nn.Module):
+    """
+    A base class for transformer block implementations.
+    """
+
+    def __init__(self, layer_id: int, config: MolmoConfig, cache: BufferCache):
+        super().__init__()
+        self.layer_id = layer_id
+        self.config = config
+        self.hidden_size = (
+            config.mlp_hidden_size if config.mlp_hidden_size is not None else config.mlp_ratio * config.d_model
+        )
+        self.__cache = cache
+        self._activation_checkpoint_fn = None
+
+        # Dropout.
+        self.dropout = Dropout(config.residual_dropout)
+
+        # Layer norms.
+        self.k_norm: Optional[LayerNormBase] = None
+        self.q_norm: Optional[LayerNormBase] = None
+        if config.attention_layer_norm:
+            assert config.effective_n_kv_heads is not None
+            self.k_norm = LayerNormBase.build(
+                config,
+                size=(config.d_model // config.n_heads) * config.effective_n_kv_heads,
+                elementwise_affine=config.attention_layer_norm_with_affine,
+            )
+            self.q_norm = LayerNormBase.build(config, elementwise_affine=config.attention_layer_norm_with_affine)
+
+        # Make sure QKV clip coefficient is positive, otherwise it's not well-defined.
+        if config.clip_qkv is not None:
+            assert config.clip_qkv > 0
+
+        # Activation function.
+        self.act = Activation.build(config)
+        assert (self.act.output_multiplier * self.hidden_size) % 1 == 0
+
+        # Attention output projection.
+        input_dim = config.d_model
+        self.attn_out = nn.Linear(
+            input_dim, config.d_model,
+            bias=config.include_bias,
+            device=config.init_device
+        )
+
+        # Feed-forward output projection.
+        self.ff_out = nn.Linear(
+            int(self.act.output_multiplier * self.hidden_size),
+            config.d_model,
+            bias=config.include_bias,
+            device=config.init_device,
+        )
+        self.ff_out._is_residual = True  # type: ignore
+
+        # Rotary embeddings.
+        if self.config.rope:
+            self.rotary_emb = RotaryEmbedding(config, self.__cache)
+
+        self.flash_attn_func = None
+        if config.attention_type == "flash":
+            try:
+                from flash_attn import flash_attn_func  # type: ignore
+
+                self.flash_attn_func = flash_attn_func
+            except ModuleNotFoundError:
+                pass
+
+    def reset_parameters(self):
+        if self.k_norm is not None:
+            self.k_norm.reset_parameters()
+        if self.q_norm is not None:
+            self.q_norm.reset_parameters()
+        init_weights(
+            self.config,
+            self.attn_out,
+            d=self.config.d_model,
+            layer_id=self.layer_id,
+            type_of_module=ModuleType.out_module,
+        )
+        init_weights(
+            self.config,
+            self.ff_out,
+            d=self.ff_out.in_features,
+            layer_id=self.layer_id,
+            type_of_module=ModuleType.out_module,
+        )
+
+    @classmethod
+    def _cast_attn_bias(cls, bias: torch.Tensor, input_dtype: torch.dtype) -> torch.Tensor:
+        target_dtype = input_dtype
+        # NOTE: `is_autocast_enabled()` only checks for CUDA autocast, so we use the separate function
+        # `is_autocast_cpu_enabled()` for CPU autocast.
+        # See https://github.com/pytorch/pytorch/issues/110966.
+        if bias.device.type == "cuda" and torch.is_autocast_enabled():
+            target_dtype = torch.get_autocast_gpu_dtype()
+        elif bias.device.type == "cpu" and torch.is_autocast_cpu_enabled():
+            target_dtype = torch.get_autocast_cpu_dtype()
+        if bias.dtype != target_dtype:
+            bias = bias.to(target_dtype)
+            ensure_finite_(bias, check_neg_inf=True, check_pos_inf=False)
+        return bias
+
+    def _scaled_dot_product_attention(
+        self,
+        q: torch.Tensor,
+        k: torch.Tensor,
+        v: torch.Tensor,
+        attn_mask: Optional[torch.Tensor] = None,
+        dropout_p: float = 0.0,
+        response_dropout_p: float = 0.0,
+        is_causal: bool = False,
+    ) -> torch.Tensor:
+        """
+        Computes scaled dot product attention on query, key and value tensors, using an optional
+        attention mask if passed, and applying dropout if a probability greater than 0.0 is specified.
+        """
+        if attn_mask is not None:
+            attn_mask = attn_mask.to(q.device)
+
+        if self.flash_attn_func is not None and attn_mask is None:
+            r = self.flash_attn_func(
+                q.transpose(1, 2), k.transpose(1, 2), v.transpose(1, 2), dropout_p=dropout_p, causal=is_causal
+            )
+            return r.transpose(1, 2)
+        else:
+            # torch's sdpa doesn't support GQA, so we're doing this
+            assert k.size(1) == v.size(1)
+            num_kv_heads = k.size(1)
+            num_q_heads = q.size(1)
+            if num_q_heads != num_kv_heads:
+                assert num_q_heads % num_kv_heads == 0
+                k = k.repeat_interleave(num_q_heads // num_kv_heads, dim=1, output_size=num_q_heads)
+                v = v.repeat_interleave(num_q_heads // num_kv_heads, dim=1, output_size=num_q_heads)
+
+            return F.scaled_dot_product_attention(
+                q,
+                k,
+                v,
+                attn_mask=attn_mask,
+                dropout_p=dropout_p,
+                is_causal=is_causal,
+            )
+
+    def attention(
+        self,
+        q: torch.Tensor,
+        k: torch.Tensor,
+        v: torch.Tensor,
+        attention_bias: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.Tensor] = None,
+        layer_past: Optional[Tuple[torch.Tensor, torch.Tensor]] = None,
+        use_cache: bool = False,
+    ) -> Tuple[torch.Tensor, Optional[Tuple[torch.Tensor, torch.Tensor]]]:
+        B, T, C = q.size()  # batch size, sequence length, d_model
+        dtype = k.dtype
+
+        # Optionally apply layer norm to keys and queries.
+        if self.q_norm is not None and self.k_norm is not None:
+            q = self.q_norm(q).to(dtype=dtype)
+            k = self.k_norm(k).to(dtype=dtype)
+
+        # Move head forward to be next to the batch dim.
+        # shape: (B, nh, T, hs)
+        q = q.view(B, T, self.config.n_heads, C // self.config.n_heads).transpose(1, 2)
+        # shape: (B, n_kv_h, T, hs)
+        k = k.view(B, T, self.config.effective_n_kv_heads, C // self.config.n_heads).transpose(1, 2)
+        # shape: (B, n_kv_h, T, hs)
+        v = v.view(B, T, self.config.effective_n_kv_heads, C // self.config.n_heads).transpose(1, 2)
+
+        if self.config.use_position_ids and self.config.rope:
+            # Apply rotary embeddings
+            q, k = self.rotary_emb(q, k, position_ids=position_ids)
+
+        if layer_past is not None:
+            past_key, past_value = layer_past
+            k = torch.cat((past_key.to(k.device), k), dim=-2)
+            v = torch.cat((past_value.to(v.device), v), dim=-2)
+
+        present = (k, v) if use_cache else None
+        query_len, key_len = q.shape[-2], k.shape[-2]  # could be different if layer_past not None
+
+        if not self.config.use_position_ids and self.config.rope:
+            # Apply rotary embeddings
+            q, k = self.rotary_emb(q, k)
+
+        if attention_bias is not None:
+            # Resize and cast attention bias.
+            # The current dtype of the attention bias might not match the dtype that the SDP attn function will
+            # run in if AMP is enabled, and this can be a problem if some tokens are masked out due to padding
+            # as down-casting the attention bias to the autocast precision will result in -infs, which will
+            # cause the SDP attn function to produce NaNs.
+            attention_bias = self._cast_attn_bias(
+                attention_bias[:, :, key_len - query_len : key_len, :key_len], dtype
+            )
+
+        # Get the attention scores.
+        # shape: (B, nh, T, hs)
+        att = self._scaled_dot_product_attention(
+            q,
+            k,
+            v,
+            attn_mask=attention_bias,
+            dropout_p=0.0 if not self.training else self.config.attention_dropout,
+            response_dropout_p=0.0 if not self.training else self.config.response_attention_dropout,
+            is_causal=attention_bias is None,
+        )
+
+        # Re-assemble all head outputs side-by-side.
+        att = att.transpose(1, 2).contiguous().view(B, T, C)
+
+        # Apply output projection.
+        return self.attn_out(att), present
+
+    def forward(
+        self,
+        x: torch.Tensor,
+        attention_bias: Optional[torch.FloatTensor] = None,
+        position_ids: Optional[torch.Tensor] = None,
+        layer_past: Optional[Tuple[torch.Tensor, torch.Tensor]] = None,
+        use_cache: bool = False,
+    ) -> Tuple[torch.Tensor, Optional[Tuple[torch.Tensor, torch.Tensor]]]:
+        raise NotImplementedError
+
+    @classmethod
+    def build(cls, layer_id: int, config: MolmoConfig, cache: BufferCache):
+        return MolmoSequentialBlock(layer_id, config, cache)
+
+
+class MolmoSequentialBlock(MolmoBlock):
+    """
+    This is a typical transformer block where the output is computed as ``MLP(LN(x + Attention(LN(x))))``
+    (plus another skip connection).
+    """
+
+    def __init__(self, layer_id: int, config: MolmoConfig, cache: BufferCache):
+        super().__init__(layer_id, config, cache)
+        # Layer norms.
+        self.attn_norm = LayerNorm.build(config)
+        self.ff_norm = LayerNorm.build(config)
+        # Attention input projection. Projects x -> (q, k, v)
+
+        head_dim = config.d_model // config.n_heads
+        self.fused_dims = (
+            config.d_model,
+            config.effective_n_kv_heads * head_dim,
+            config.effective_n_kv_heads * head_dim,
+        )
+        self.att_proj = nn.Linear(
+            config.d_model, sum(self.fused_dims),
+            bias=config.include_bias or config.qkv_bias,
+            device=config.init_device
+        )
+        # Feed-forward input projection.
+        self.ff_proj = nn.Linear(
+            config.d_model, self.hidden_size, bias=config.include_bias, device=config.init_device
+        )
+
+    def reset_parameters(self):
+        super().reset_parameters()
+        self.attn_norm.reset_parameters()
+        self.ff_norm.reset_parameters()
+        # NOTE: the standard deviation for these weights does not depend on the layer.
+        init_weights(
+            self.config, self.att_proj, d=self.config.d_model, layer_id=None, type_of_module=ModuleType.in_module
+        )
+        init_weights(
+            self.config, self.ff_proj, d=self.config.d_model, layer_id=None, type_of_module=ModuleType.in_module
+        )
+
+    def forward(
+        self,
+        x: torch.Tensor,
+        attention_bias: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.Tensor] = None,
+        layer_past: Optional[Tuple[torch.Tensor, torch.Tensor]] = None,
+        use_cache: bool = False,
+    ) -> Tuple[torch.Tensor, Optional[Tuple[torch.Tensor, torch.Tensor]]]:
+        # Get query, key, value projections.
+        # shape:
+        #  - for regular attn q, k, v: (batch_size, seq_len, d_model)
+        #  - for multi-query attn q: (batch_size, seq_len, d_model)
+        #                      k, v: (batch_size, seq_len, d_model // n_heads)
+        #  - for group query attn q: (batch_size, seq_len, d_model)
+        #                      k, v: (batch_size, seq_len, d_model // n_kv_heads)
+
+        if not self.config.norm_after:
+            if self._activation_checkpoint_fn is not None:
+                atten_in = self._activation_checkpoint_fn(self.attn_norm, x)
+            else:
+                atten_in = self.attn_norm(x)
+        else:
+            atten_in = x
+        qkv = self.att_proj(atten_in)
+
+        if self.config.clip_qkv is not None:
+            qkv.clamp_(min=-self.config.clip_qkv, max=self.config.clip_qkv)
+
+        q, k, v = qkv.split(self.fused_dims, dim=-1)
+
+        # Get attention scores.
+        if self._activation_checkpoint_fn is not None:
+            att, cache = self._activation_checkpoint_fn(  # type: ignore
+                self.attention, q, k, v, attention_bias, position_ids=position_ids, layer_past=layer_past, use_cache=use_cache
+            )
+        else:
+            att, cache = self.attention(q, k, v, attention_bias, position_ids=position_ids, layer_past=layer_past, use_cache=use_cache)
+
+        if self.config.norm_after:
+            if self._activation_checkpoint_fn is not None:
+                att = self._activation_checkpoint_fn(self.attn_norm, att)
+            else:
+                att = self.attn_norm(att)
+
+        # Add attention scores.
+        # shape: (B, T, C)
+        x = x + self.dropout(att)
+
+        # Add feed-forward projection.
+        # shape: (batch_size, seq_len, d_model)
+        og_x = x
+
+        if not self.config.norm_after:
+            if self._activation_checkpoint_fn is not None:
+                x = self._activation_checkpoint_fn(self.ff_norm, x)  # type: ignore
+            else:
+                x = self.ff_norm(x)
+
+        x = self.ff_proj(x)
+        if self._activation_checkpoint_fn is not None:
+            x = self._activation_checkpoint_fn(self.act, x)  # type: ignore
+        else:
+            x = self.act(x)
+        x = self.ff_out(x)
+
+        if self.config.norm_after:
+            if self._activation_checkpoint_fn is not None:
+                x = self._activation_checkpoint_fn(self.ff_norm, x)  # type: ignore
+            else:
+                x = self.ff_norm(x)
+
+        x = self.dropout(x)
+        x = og_x + x
+
+        return x, cache
+
+
+class Embedding(nn.Module):
+    def __init__(
+        self,
+        num_embeddings: int,
+        num_new_embeddings: int,
+        features: int,
+        device: Union[str, torch.device],
+        initializer_range: float = 0.02,
+        new_embed_initializer_range: float = 0.02,
+    ):
+        super().__init__()
+        self.initializer_range = initializer_range
+        self.new_embed_initializer_range = new_embed_initializer_range
+        self.embedding = nn.Parameter(
+            torch.zeros(num_embeddings, features, device=device),
+        )
+        self.new_embedding = nn.Parameter(
+            torch.zeros(num_new_embeddings, features, device=device),
+        )
+
+    def reset_parameters(self):
+        nn.init.normal_(self.embedding, std=self.initializer_range)
+        nn.init.normal_(self.new_embedding, std=self.new_embed_initializer_range)
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        return F.embedding(x, torch.cat([self.embedding, self.new_embedding], dim=0))
+
+
+class Dropout(nn.Dropout):
+    def __init__(
+        self,
+        p: float = 0.5,
+        inplace: bool = False,
+        mask_p: float = 0,
+        broadcast_dims: Sequence[int] = (),
+    ):
+        super().__init__(p, inplace)
+        self.mask_p = mask_p
+        self.broadcast_dims = broadcast_dims
+
+    def forward(self, input: torch.Tensor) -> torch.Tensor:
+        """
+        :param input: A tensor of shape `(batch_size, seq_len, embed_dim)`
+        """
+        if self.p == 0.0 and (self.mask_p is None or self.mask_p == 0.0):
+            return input
+        else:
+            if self.p > 0. and len(self.broadcast_dims) > 0 and self.training:
+                keep_prob = 1.0 - self.p
+                dropout_shape = list(input.shape)
+                for dim in self.broadcast_dims:
+                    dropout_shape[dim] = 1
+                keep = input.new_empty(dropout_shape).bernoulli_(keep_prob)
+                multiplier = keep.broadcast_to(input.shape)
+                multiplier.div_(keep_prob)
+                input = input * multiplier
+            else:
+                return F.dropout(input, self.p, self.training, self.inplace)
+
+
+@dataclass
+class VisionBackboneConfig:
+    image_default_input_size: Tuple[int, int] = (336, 336)
+    image_patch_size: int = 14
+    image_pos_patch_size: int = 14
+    image_emb_dim: int = 1024
+    image_num_heads: int = 16
+    image_num_key_value_heads: int = 16
+    image_num_layers: int = 24
+    image_head_dim: int = 64
+    image_mlp_dim: int = 4096
+    image_mlp_activations: str = "gelu"
+    image_dropout_rate: float = 0.0
+    image_num_pos: int = 577
+    image_norm_eps: float = 1e-5
+    attention_dropout: float = 0.0
+    residual_dropout: float = 0.0
+    initializer_range: float = 0.02
+    fsdp_wrap: bool = False
+    resize_mode: str = "default"
+
+    def __post_init__(self):
+        self.image_default_input_size = tuple(self.image_default_input_size)  # type: ignore[assignment]
+
+    @property
+    def image_num_patch(self):
+        h, w = self.image_default_input_size
+        return h // self.image_patch_size, w // self.image_patch_size
+
+
+@dataclass
+class FullMolmoConfig:
+    d_model: int = 768
+    n_heads: int = 12
+    n_kv_heads: Optional[int] = None
+    qkv_bias: bool = False
+    clip_qkv: Optional[float] = None
+    n_layers: int = 12
+    mlp_ratio: int = 4
+    mlp_hidden_size: Optional[int] = None
+    activation_type: str = "swiglu"
+    block_group_size: int = 1
+    rope: bool = True
+    rope_full_precision: bool = True
+    rope_theta: float = 10000.
+    rope_impl: str = "interleave"
+    vision_backbone: Optional[VisionBackboneConfig] = None
+    attention_type: str = "sdpa"
+    float32_attention: bool = True
+    attention_dropout: float = 0.1
+    response_attention_dropout: float = 0.0
+    multi_query_attention: Optional[bool] = None
+    attention_layer_norm: bool = False
+    residual_dropout: float = 0.1
+    embedding_dropout: float = 0.1
+    layer_norm_type: str = "default"
+    layer_norm_with_affine: bool = True
+    layer_norm_eps: Optional[float] = None
+    attention_layer_norm_with_affine: bool = True
+    max_sequence_length: int = 1024
+    max_position_embeddings: Optional[int] = None
+    include_bias: bool = True
+    bias_for_layer_norm: Optional[bool] = None
+    scale_logits: bool = False
+    vocab_size: int = 50257
+    embedding_size: Optional[int] = 50304
+    additional_vocab_size: Optional[int] = None
+    new_embedding_init_range: float = 0.02
+    weight_tying: bool = True
+    pad_token_id: int = -1
+    init_device: Optional[str] = None
+    init_std: float = 0.02
+    init_cutoff_factor: Optional[float] = None
+    norm_after: bool = False
+    precision: Optional[str] = None
+    image_padding_embed: Optional[str] = None
+    vit_layers: Tuple = (-1,)
+    image_pooling_h: int = 2
+    image_pooling_w: int = 2
+    image_pooling_2d: str = "attention"
+    image_projector: str = "mlp"
+    image_feature_dropout: float = 0.0
+    initializer_range: float = 0.02
+    normalize_input_embeds: bool = False
+    use_position_ids: bool = True
+
+    @property
+    def effective_n_kv_heads(self) -> int:
+        if self.n_kv_heads is None:
+            if self.multi_query_attention is True:
+                return 1
+            else:
+                return self.n_heads
+        else:
+            if self.multi_query_attention is None:
+                return self.n_kv_heads
+            if self.multi_query_attention:
+                n_kv_heads_should_be = 1
+            else:
+                n_kv_heads_should_be = self.n_heads
+            if self.n_kv_heads == n_kv_heads_should_be:
+                return n_kv_heads_should_be
+            else:
+                raise MolmoConfigurationError(
+                    "You can't set `multi_query_attention` and `n_kv_heads` at the same time."
+                )
+
+    @property
+    def image_num_patch(self):
+        assert self.vision_backbone is not None
+        return self.vision_backbone.image_num_patch
+
+    @property
+    def image_patch_size(self):
+        assert self.vision_backbone is not None
+        return self.visoin_backbone.image_patch_size
+
+    def llm_patches_per_crop(self):
+        h, w = self.image_num_patch
+        # Round up in case we need to pad the image features for pooling
+        h = (h + self.image_pooling_h - 1) // self.image_pooling_h
+        w = (w + self.image_pooling_w - 1) // self.image_pooling_w
+        return h, w
+
+
+def _expand_token(token, batch_size: int):
+    return token.view(1, 1, -1).expand(batch_size, -1, -1)
+
+
+class ViTMLP(nn.Module):
+    def __init__(self, config: FullMolmoConfig):
+        super().__init__()
+        self.config = config
+        v_cfg = config.vision_backbone
+
+        self.w1 = nn.Linear(
+            v_cfg.image_emb_dim,
+            v_cfg.image_mlp_dim,
+            bias=True,
+            device=config.init_device,
+        )
+        # Activation function.
+        cfg = deepcopy(config)
+        cfg.activation_type = v_cfg.image_mlp_activations
+        self.act = Activation.build(cfg)
+        self.w2 = nn.Linear(
+            v_cfg.image_mlp_dim,
+            v_cfg.image_emb_dim,
+            bias=True,
+            device=config.init_device,
+        )
+
+    def reset_parameters(self):
+        v_cfg = self.config.vision_backbone
+        nn.init.trunc_normal_(self.w1.weight, std=math.sqrt(1 / v_cfg.image_emb_dim), a=-2.0, b=2.0)
+        nn.init.trunc_normal_(self.w2.weight, std=math.sqrt(1 / v_cfg.image_mlp_dim), a=-2.0, b=2.0)
+        nn.init.zeros_(self.w1.bias)
+        nn.init.zeros_(self.w2.bias)
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        x = self.w1(x)
+        x = self.act(x)
+        x = self.w2(x)
+        return x
+
+
+class ResidualAttentionBlock(nn.Module):
+
+    def __init__(self, config: FullMolmoConfig):
+        super().__init__()
+        self.config = config
+
+        v_cfg = config.vision_backbone
+        self.attention = MultiHeadDotProductAttention(config)
+        self.feed_forward = ViTMLP(config)
+        self.attention_norm = nn.LayerNorm(
+            v_cfg.image_emb_dim,
+            eps=v_cfg.image_norm_eps,
+            device=config.init_device,
+        )
+        self.ffn_norm = nn.LayerNorm(
+            v_cfg.image_emb_dim,
+            eps=v_cfg.image_norm_eps,
+            device=config.init_device,
+        )
+
+    def reset_parameters(self):
+        self.attention.reset_parameters()
+        self.feed_forward.reset_parameters()
+        self.attention_norm.reset_parameters()
+        self.ffn_norm.reset_parameters()
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        x = x + self.attention(self.attention_norm(x))
+        x = x + self.feed_forward(self.ffn_norm(x))
+        return x
+
+
+class BlockCollection(nn.Module):
+
+    def __init__(self, config: FullMolmoConfig):
+        super().__init__()
+        self.config = config
+        self.grad_checkpointing: bool = False
+
+        v_cfg = config.vision_backbone
+        self.resblocks = nn.ModuleList([
+            ResidualAttentionBlock(config) for _ in range(v_cfg.image_num_layers)
+        ])
+
+    def reset_parameters(self):
+        for r in self.resblocks:
+            r.reset_parameters()
+
+    def forward(self, x: torch.Tensor) -> List[torch.Tensor]:
+        hidden_states = []
+        for r in self.resblocks:
+            x = r(x)
+            hidden_states.append(x)
+        return hidden_states
+
+
+class LayerNormFp32(nn.LayerNorm):
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        orig_type = x.dtype
+        x = F.layer_norm(x.to(torch.float32), self.normalized_shape, self.weight.to(torch.float32),
+                         self.bias.to(torch.float32), self.eps)
+        return x.to(orig_type)
+
+
+class VisionTransformer(nn.Module):
+
+    def __init__(self, config: FullMolmoConfig):
+        super().__init__()
+        self.config = config
+
+        v_cfg = config.vision_backbone
+        # class embeddings and positional embeddings
+        self.scale = v_cfg.image_emb_dim ** -0.5
+        self.class_embedding = nn.Parameter(
+            torch.zeros(v_cfg.image_emb_dim, device=config.init_device),
+        )
+        self.num_prefix_tokens: int = 1
+        self.positional_embedding = nn.Parameter(
+            torch.zeros(v_cfg.image_num_pos, v_cfg.image_emb_dim, device=config.init_device),
+        )
+
+        image_patch_size = v_cfg.image_patch_size
+        self.patch_embedding = nn.Linear(
+            image_patch_size * image_patch_size * 3,
+            v_cfg.image_emb_dim,
+            bias=False,
+            device=config.init_device,
+            )
+
+        self.pre_ln = LayerNormFp32(
+            v_cfg.image_emb_dim,
+            eps=v_cfg.image_norm_eps,
+        )
+
+        self.transformer = BlockCollection(config)
+
+    @torch.jit.ignore
+    def set_grad_checkpointing(self, enable=True):
+        self.transformer.grad_checkpointing = enable
+
+    def reset_parameters(self):
+        nn.init.normal_(self.class_embedding, std=self.scale)
+        nn.init.normal_(self.positional_embedding, std=self.scale)
+        nn.init.normal_(self.patch_embedding.weight, std=0.02)
+        self.pre_ln.reset_parameters()
+        self.transformer.reset_parameters()
+
+    def add_pos_emb(self, x: torch.Tensor, patch_num: int) -> torch.Tensor:
+        cls_emb = self.positional_embedding[0:1]
+        pos_emb = self.positional_embedding[1:]
+
+        pos_emb = pos_emb.reshape(
+            (int(math.sqrt(pos_emb.shape[0])), int(math.sqrt(pos_emb.shape[0])), pos_emb.shape[1])
+        )
+
+        (patch_num_0, patch_num_1) = patch_num
+
+        if pos_emb.shape[0] != patch_num_0 or pos_emb.shape[1] != patch_num_1:
+            # Dervied from https://github.com/facebookresearch/mae/blob/main/util/pos_embed.py
+            # antialias: default True in jax.image.resize
+            pos_emb = pos_emb.unsqueeze(0).permute(0, 3, 1, 2)
+            pos_emb = F.interpolate(
+                pos_emb, size=(patch_num_0, patch_num_1), mode="bicubic", align_corners=False, antialias=True,
+            )
+            pos_emb = pos_emb.permute(0, 2, 3, 1).squeeze(0)
+
+        pos_emb = pos_emb.reshape(-1, pos_emb.shape[-1])
+        x = x + torch.cat([cls_emb[None, :, :], pos_emb[None, :, :]], dim=1).to(x.dtype)
+        return x
+
+    def forward(self, x: torch.Tensor, patch_num: int = None) -> List[torch.Tensor]:
+        """
+        : param x: (batch_size, num_patch, n_pixels)
+        """
+        if patch_num is None:
+            patch_num = self.config.vision_backbone.image_num_patch
+        B, N, D = x.shape
+
+        x = self.patch_embedding(x)
+
+        # class embeddings and positional embeddings
+        x = torch.cat([_expand_token(self.class_embedding, x.shape[0]).to(x.dtype), x], dim=1)
+        x = self.add_pos_emb(x, patch_num)
+
+        x = self.pre_ln(x)
+
+        hidden_states = self.transformer(x)
+        return hidden_states
+
+
+class MultiHeadDotProductAttention(nn.Module):
+    def __init__(self, config: FullMolmoConfig, use_bias: bool = True, is_vit_layer: Optional[bool] = True):
+        super().__init__()
+        self.config = config
+        self.use_bias = use_bias
+
+        v_cfg = config.vision_backbone
+        self.embed_dim = v_cfg.image_emb_dim
+        self.num_heads = v_cfg.image_num_heads
+        self.head_dim = v_cfg.image_head_dim
+        self.num_key_value_heads = v_cfg.image_num_key_value_heads
+        self.num_key_value_groups = self.num_heads // self.num_key_value_heads
+        self.initializer_range = v_cfg.initializer_range
+        self.is_vit_layer = is_vit_layer
+
+        nlayers = 1 if (is_vit_layer or config.vit_layers is None) else len(config.vit_layers)
+
+        self.wq = nn.Linear(
+            nlayers * self.embed_dim,
+            self.num_heads * self.head_dim,
+            bias=use_bias,
+            device=config.init_device,
+            )
+        self.wk = nn.Linear(
+            nlayers * self.embed_dim,
+            self.num_key_value_heads * self.head_dim,
+            bias=use_bias,
+            device=config.init_device,
+            )
+        self.wv = nn.Linear(
+            nlayers * self.embed_dim,
+            self.num_key_value_heads * self.head_dim,
+            bias=use_bias,
+            device=config.init_device,
+            )
+        self.wo = nn.Linear(
+            self.num_heads * self.head_dim,
+            self.embed_dim,
+            bias=use_bias,
+            device=config.init_device,
+            )
+        self.attention_dropout: Optional[Dropout] = None
+        if v_cfg.attention_dropout > 0:
+            self.attention_dropout = Dropout(v_cfg.attention_dropout, broadcast_dims=(0, 1))
+        self.residual_dropout = Dropout(v_cfg.residual_dropout)
+
+    def reset_parameters(self):
+        nn.init.normal_(self.wq.weight, std=self.initializer_range)
+        nn.init.normal_(self.wk.weight, std=self.initializer_range)
+        nn.init.normal_(self.wv.weight, std=self.initializer_range)
+        nn.init.normal_(self.wo.weight, std=self.initializer_range)
+        if self.use_bias:
+            nn.init.constant_(self.wq.bias, 0)
+            nn.init.constant_(self.wk.bias, 0)
+            nn.init.constant_(self.wv.bias, 0)
+            nn.init.constant_(self.wo.bias, 0)
+
+    def _split_heads(self, hidden_states, num_heads) -> torch.Tensor:
+        return hidden_states.reshape(hidden_states.shape[:2] + (num_heads, self.head_dim))
+
+    def _merge_heads(self, hidden_states) -> torch.Tensor:
+        return hidden_states.reshape(hidden_states.shape[:2] + (self.embed_dim,))
+
+    def forward(self, inputs_q: torch.Tensor, inputs_kv: Optional[torch.Tensor] = None) -> torch.Tensor:
+
+        if inputs_kv is not None:
+            inputs_k = inputs_kv
+            inputs_v = inputs_kv
+        else:
+            inputs_k = inputs_q
+            inputs_v = inputs_q
+
+        xq, xk, xv = self.wq(inputs_q), self.wk(inputs_k), self.wv(inputs_v)
+
+        xq = self._split_heads(xq, self.num_heads)
+        xk = self._split_heads(xk, self.num_key_value_heads)
+        xv = self._split_heads(xv, self.num_key_value_heads)
+
+        if self.num_heads != self.num_key_value_heads:
+            xk = xk.repeat_interleave(self.num_key_value_groups, dim=2, output_size=self.num_heads)
+            xv = xv.repeat_interleave(self.num_key_value_groups, dim=2, output_size=self.num_heads)
+
+        og_dtype = xq.dtype
+
+        if self.config.float32_attention:
+            xq = xq.to(torch.float)
+            xk = xk.to(torch.float)
+
+        if self.config.attention_type == "direct":
+            attn_weights = torch.einsum("...qhd,...khd->...hqk", xq / math.sqrt(xq.size(-1)), xk)
+            attn_weights = F.softmax(attn_weights, dim=-1, dtype=torch.float32).to(xq.dtype)
+            if self.attention_dropout is not None:
+                attn_weights = self.attention_dropout(attn_weights)
+            attn_output = torch.einsum("...hqk,...khd->...qhd", attn_weights.to(xv.dtype), xv)
+
+        elif self.config.attention_type == "sdpa":
+            if self.config.float32_attention and not torch.is_autocast_enabled():
+                xv = xv.to(torch.float32)
+            attn_output = F.scaled_dot_product_attention(
+                xq.transpose(1, 2).contiguous(),
+                xk.transpose(1, 2).contiguous(),
+                xv.transpose(1, 2).contiguous(),
+                is_causal=False,
+                dropout_p=self.config.vision_backbone.attention_dropout
+            ).transpose(1, 2)
+        else:
+            raise NotImplementedError(self.config.attention_type)
+        attn_output = attn_output.to(og_dtype)
+        attn_output = self._merge_heads(attn_output)
+        attn_output = self.wo(attn_output)
+        attn_output = self.residual_dropout(attn_output)
+
+        return attn_output
+
+
+class MultiHeadAttentionPool(nn.Module):
+    def __init__(
+        self,
+        config: FullMolmoConfig,
+        factor: int = 1,
+        use_bias: bool = True,
+        dropout: bool = True,
+        output_layer: bool = True,
+        mean_residual: bool = False,
+        query: str = "mean",
+        is_vit_layer: Optional[bool] = True
+    ):
+        super().__init__()
+        self.config = config
+        self.factor = factor
+        self.use_bias = use_bias
+        self.dropout = dropout
+        self.output_layer = output_layer
+        self.mean_residual = mean_residual
+        self.query = query
+
+        v_cfg = config.vision_backbone
+        input_dim = v_cfg.image_emb_dim
+        self.embed_dim = v_cfg.image_emb_dim * factor
+        self.num_heads = v_cfg.image_num_heads
+        self.head_dim = v_cfg.image_head_dim * factor
+        self.num_key_value_heads = v_cfg.image_num_key_value_heads
+        self.num_key_value_groups = self.num_heads // self.num_key_value_heads
+        self.initializer_range = v_cfg.initializer_range
+
+        nlayers = 1 if (is_vit_layer or config.vit_layers is None) else len(config.vit_layers)
+
+        if query != "vector":
+            self.wq = nn.Linear(
+                nlayers * input_dim,
+                self.num_heads * self.head_dim,
+                bias=use_bias,
+                device=config.init_device,
+                )
+        self.wk = nn.Linear(
+            nlayers * input_dim,
+            self.num_key_value_heads * self.head_dim,
+            bias=use_bias,
+            device=config.init_device,
+            )
+        self.wv = nn.Linear(
+            nlayers * input_dim,
+            self.num_key_value_heads * self.head_dim,
+            bias=use_bias,
+            device=config.init_device,
+            )
+
+        if query == "vector":
+            self.attention_query = nn.Parameter(
+                torch.zeros(
+                    1, self.num_key_value_heads * self.head_dim, device=config.init_device,
+                       ),
+            )
+
+        if output_layer:
+            self.wo = nn.Linear(
+                self.num_heads * self.head_dim,
+                self.embed_dim,
+                bias=use_bias,
+                device=config.init_device,
+                )
+        self.attention_dropout = Dropout(v_cfg.attention_dropout, broadcast_dims=(0, 1))
+        if dropout:
+            self.residual_dropout = Dropout(v_cfg.residual_dropout)
+
+    def reset_parameters(self):
+        if self.query != "vector":
+            nn.init.normal_(self.wq.weight, std=self.initializer_range)
+        nn.init.normal_(self.wk.weight, std=self.initializer_range)
+        nn.init.normal_(self.wv.weight, std=self.initializer_range)
+        if self.output_layer:
+            nn.init.normal_(self.wo.weight, std=self.initializer_range)
+        if self.use_bias:
+            if self.query != "vector":
+                nn.init.constant_(self.wq.bias, 0)
+            nn.init.constant_(self.wk.bias, 0)
+            nn.init.constant_(self.wv.bias, 0)
+            if self.output_layer:
+                nn.init.constant_(self.wo.bias, 0)
+        if self.query == "vector":
+            nn.init.normal_(self.attention_query, std=self.initializer_range)
+
+    def _split_heads(self, hidden_states, num_heads):
+        return hidden_states.reshape(hidden_states.shape[:2] + (num_heads, self.head_dim))
+
+    def _merge_heads(self, hidden_states):
+        return hidden_states.reshape(hidden_states.shape[:2] + (self.embed_dim,))
+
+    def forward(self, inputs_kv: torch.Tensor) -> torch.Tensor:
+
+        xk, xv = self.wk(inputs_kv), self.wv(inputs_kv)
+
+        if self.query == "mean":
+            inputs_q = inputs_kv.mean(dim=1, keepdim=True)
+            xq = self.wq(inputs_q)
+        elif self.query == "first":
+            inputs_q = inputs_kv[:, :1]
+            xq = self.wq(inputs_q)
+        elif self.query == "vector":
+            xq = self.attention_query.expand(inputs_kv.size(0), -1, -1)
+        elif self.query == "constant":
+            inputs_q = torch.ones_like(inputs_kv[:, :1]) / math.sqrt(inputs_kv.shape[-1])
+            xq = self.wq(inputs_q)
+        else:
+            raise ValueError(f"Unknown query type: {self.query}")
+
+        xq = self._split_heads(xq, self.num_heads)
+        xk = self._split_heads(xk, self.num_key_value_heads)
+        xv = self._split_heads(xv, self.num_key_value_heads)
+
+        if self.num_heads != self.num_key_value_heads:
+            xk = xk.repeat_interleave(self.num_key_value_groups, dim=2, output_size=self.num_heads)
+            xv = xv.repeat_interleave(self.num_key_value_groups, dim=2, output_size=self.num_heads)
+
+        xq = xq.to(torch.float)
+        xk = xk.to(torch.float)
+
+        xq = xq / math.sqrt(xq.size(-1))
+        attn_weights = torch.einsum("...qhd,...khd->...hqk", xq, xk)
+
+        attn_weights = F.softmax(attn_weights, dim=-1).to(xq.dtype)
+
+        attn_weights = self.attention_dropout(attn_weights).to(xv.dtype)
+
+        attn_output = torch.einsum("...hqk,...khd->...qhd", attn_weights, xv)
+        attn_output = self._merge_heads(attn_output)
+        if self.output_layer:
+            attn_output = self.wo(attn_output)
+        if self.dropout:
+            attn_output = self.residual_dropout(attn_output)
+        if self.mean_residual:
+            attn_output += inputs_kv.mean(dim=1, keepdim=True)
+
+        return attn_output
+
+
+class MLP(nn.Module):
+    def __init__(self, config: FullMolmoConfig, input_dim: int, dropout: float = 0.0):
+        super().__init__()
+        self.config = config
+        self.hidden_size = (
+            config.mlp_hidden_size if config.mlp_hidden_size is not None else config.mlp_ratio * config.d_model
+        )
+        self.initializer_range = config.initializer_range
+
+        self.w1 = nn.Linear(
+            input_dim,
+            self.hidden_size // 2,
+            bias=False,
+            device=config.init_device,
+            )
+        self.w2 = nn.Linear(
+            self.hidden_size // 2,
+            config.d_model,
+            bias=False,
+            device=config.init_device,
+            )
+        self.w3 = nn.Linear(
+            input_dim,
+            self.hidden_size // 2,
+            bias=False,
+            device=config.init_device,
+            )
+        # Activation function.
+        self.act = Activation.build(config)
+        self.dropout = Dropout(dropout)
+
+    def reset_parameters(self):
+        nn.init.normal_(self.w1.weight, std=self.initializer_range)
+        nn.init.normal_(self.w2.weight, std=self.initializer_range)
+        nn.init.normal_(self.w3.weight, std=self.initializer_range)
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        x = self.w2(self.act(self.w1(x), self.w3(x)))
+        x = self.dropout(x)
+        return x
+
+
+class Residual(nn.Module):
+    def __init__(self, submodule: nn.Module):
+        super().__init__()
+        self.submodule = submodule
+
+    def reset_parameters(self):
+        self.submodule.reset_parameters()
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        return x + self.submodule(x)
+
+
+class OLMoVisionBackbone(nn.Module):
+    def __init__(self, config: FullMolmoConfig):
+        super().__init__()
+        self.config = config
+        self.image_vit = VisionTransformer(config)
+
+        input_dim: int = None
+        self.image_pooling_2d: nn.Module = None
+        if config.image_pooling_2d in {ImagePooling2DType.attention, ImagePooling2DType.attention_meanq}:
+            self.image_pooling_2d = MultiHeadDotProductAttention(config, is_vit_layer=False)
+            input_dim = config.vision_backbone.image_emb_dim
+        elif config.image_pooling_2d == ImagePooling2DType.attention_2wide:
+            cfg = deepcopy(config)
+            cfg.vision_backbone.image_emb_dim *= 2
+            cfg.vision_backbone.image_head_dim *= 2
+            self.image_pooling_2d = MultiHeadDotProductAttention(cfg, is_vit_layer=False)
+            input_dim = cfg.vision_backbone.image_emb_dim
+        elif config.image_pooling_2d == ImagePooling2DType.attention_v2:
+            assert config.vit_layers is not None
+            use_bias = True
+            dropout = True
+            output_layer = True
+            query = "mean"
+            mean_residual = False
+            factor = len(config.vit_layers)
+            self.image_pooling_2d = MultiHeadAttentionPool(
+                config,
+                factor=factor,
+                use_bias=use_bias,
+                dropout=dropout,
+                output_layer=output_layer,
+                mean_residual=mean_residual,
+                query=query,
+                is_vit_layer=False,
+            )
+            input_dim = config.vision_backbone.image_emb_dim * factor
+        elif config.image_pooling_2d in [ImagePooling2DType.none, ImagePooling2DType.stack]:
+            self.image_pooling_2d = None
+            nlayers = 1 if config.vit_layers is None else len(config.vit_layers)
+            input_dim = nlayers * config.vision_backbone.image_emb_dim
+        else:
+            raise NotImplementedError(f"Unknown image pooling 2D method: {config.image_pooling_2d}")
+
+        self.input_dim = input_dim
+
+        # `MLP` assume the activation takes two inputs, so it must be a 'llama' version
+        if config.activation_type == ActivationType.swiglu:
+            mlp_config = replace(config, activation_type=ActivationType.llama_swiglu)
+        elif config.activation_type == ActivationType.gelu:
+            mlp_config = replace(config, activation_type=ActivationType.llama_geglu)
+        else:
+            mlp_config = config
+        if config.image_projector == ImageProjectType.mlpx2:
+            self.image_projector = nn.ModuleList(
+                [MLP(mlp_config, input_dim), Residual(MLP(config, input_dim))]
+            )
+        elif config.image_projector == ImageProjectType.mlp:
+            self.image_projector = MLP(mlp_config, input_dim)
+        elif config.image_projector == ImageProjectType.linear:
+            self.image_projector = nn.Linear(
+                input_dim,
+                config.d_model,
+                bias=False,
+                device=config.init_device,
+            )
+        else:
+            raise NotImplementedError(f"Unknown image projector: {config.image_projector}")
+
+        self.image_feature_dropout = Dropout(config.image_feature_dropout)
+
+    def reset_parameters(self):
+        if self.image_pooling_2d is not None:
+            self.image_pooling_2d.reset_parameters()
+        if self.config.image_projector == "2mlp":
+            for module in self.image_projector:
+                module.reset_parameters()
+        elif self.config.image_projector == "linear":
+            nn.init.xavier_uniform_(self.image_projector.weight)
+        else:
+            self.image_projector.reset_parameters()
+
+    def forward(self, images: torch.Tensor, image_masks: torch.Tensor) -> Tuple[torch.Tensor, Optional[torch.Tensor]]:
+        raise NotImplementedError
+
+
+class OLMoPretrainedVisionBackbone(OLMoVisionBackbone):
+    def __init__(self, config: FullMolmoConfig):
+        super().__init__(config)
+        v_cfg = self.config.vision_backbone
+        self.grad_checkpointing = False
+
+        self.num_prefix_tokens = self.image_vit.num_prefix_tokens
+        assert self.num_prefix_tokens in {0, 1}, "Only 0 or 1 prefix tokens are supported"
+
+        self.pad_embed = None
+        if config.image_padding_embed:
+            image_dim = v_cfg.image_emb_dim*len(self.config.vit_layers)
+            if config.image_padding_embed in ["pad_embed", "regress"]:
+                self.pad_embed = nn.Parameter(
+                    torch.zeros((image_dim,), device=config.init_device))
+            elif config.image_padding_embed == "pad_and_partial_pad":
+                self.pad_embed = nn.Parameter(
+                    torch.zeros((2, image_dim), device=config.init_device))
+            else:
+                raise ValueError(config.image_padding_embed)
+
+    def reset_parameters(self):
+        super().reset_parameters()
+        self.image_vit.reset_parameters()
+
+    def encode_image(self, images: torch.Tensor) -> torch.Tensor:
+        """
+        : param images: (batch_size, num_crops, num_patch, n_pixels)
+        """
+        cfg = self.config
+        v_cfg = self.config.vision_backbone
+        B, T, N, D = images.shape
+
+        mask = ~torch.all(images.view(B * T, N, D) == -1, dim=(1, 2), keepdim=True)
+
+        # Output all hidden states
+        # n_layers x (batch_num_crops, (1+)n_tokens, image_emb_dim)
+        images = images.view(B * T, N, D)
+        image_features = self.image_vit(images)
+
+        if cfg.vit_layers is not None:
+            features = []
+            for layer in cfg.vit_layers:
+                features.append(image_features[layer])
+            image_features = torch.cat(features, dim=-1)
+        else:
+            image_features = image_features[-1]
+
+        cls_embed: torch.Tensor = None
+        if self.num_prefix_tokens > 0:
+            cls_embed = image_features[:, 0]
+            image_features = image_features[:, 1:]
+
+        image_features = image_features * mask
+        image_features = image_features.view(B, T, N, -1)
+
+        cls_embed = cls_embed.view(B, T, -1) if cls_embed is not None else None
+
+        return image_features, cls_embed
+
+    def forward(self, images: torch.Tensor, image_masks: torch.Tensor) -> Tuple[torch.Tensor, Optional[torch.Tensor]]:
+        cfg = self.config
+
+        # image_features: (batch_size, num_crops(=num_image), num_patch, nximage_emb_dim)
+        batch_size, num_image = images.shape[:2]
+        image_features, cls_embed = self.encode_image(images)
+
+        if cfg.image_padding_embed:
+            assert image_masks is not None
+            if cfg.image_padding_embed == "pad_embed":
+                all_pad = (image_masks == 0).to(dtype=torch.float32)
+                pad_embed = self.pad_embed[None, None, None, :]
+                image_features = image_features + pad_embed * torch.unsqueeze(all_pad, -1)
+            elif cfg.image_padding_embed == "regress":
+                pad_embed = self.pad_embed[None, None, None, :]
+                image_features = image_features + pad_embed * torch.unsqueeze(torch.maximum(image_masks, torch.zeros_like(image_masks)), -1)
+            elif cfg.image_padding_embed == "pad_and_partial_pad":
+                pad_embed = self.pad_embed[:, None, None, None, :]
+                all_pad = image_masks == 0
+                partial_pad = torch.logical_and(image_masks < 1, torch.logical_not(all_pad)).to(dtype=image_features.dtype)
+                all_pad = all_pad.to(dtype=image_features.dtype)
+                image_features = image_features + pad_embed[0] * torch.unsqueeze(all_pad, -1)
+                image_features = image_features + pad_embed[1] * torch.unsqueeze(partial_pad, -1)
+            else:
+                raise ValueError(cfg.image_padding_embed)
+
+        image_features = self.image_feature_dropout(image_features)
+        if cls_embed is not None:
+            cls_embed = self.image_feature_dropout(cls_embed)
+
+        image_features = image_features.reshape(
+            (batch_size, num_image) + cfg.image_num_patch + (-1,),
+            )
+
+        if cfg.image_num_patch[0] % cfg.image_pooling_h == 1:
+            # Pad so we can still pool 2x2 patches
+            image_features = F.pad(
+                image_features,
+                (0, 0, 0, 1, 0, 1, 0, 0, 0, 0),
+            )
+
+        # image pooling
+        image_features = einops.rearrange(
+            image_features,
+            'b n (h dh) (w dw) c -> (b n h w) (dh dw) c',
+            dh=cfg.image_pooling_h,
+            dw=cfg.image_pooling_w,
+        )
+
+        if cfg.image_pooling_2d == ImagePooling2DType.attention_meanq:
+            query = image_features.mean(-2, keepdim=True)
+            image_features = self.image_pooling_2d(query, image_features)
+        elif cfg.image_pooling_2d not in {ImagePooling2DType.none, ImagePooling2DType.stack}:
+            if self.grad_checkpointing:
+                from torch.utils.checkpoint import checkpoint
+                image_features = checkpoint(self.image_pooling_2d, image_features[:, :1, :], image_features, use_reentrant=False)
+            else:
+                image_features = self.image_pooling_2d(image_features[:, :1, :], image_features)
+
+        h, w = cfg.llm_patches_per_crop()
+        image_features = image_features.reshape(batch_size, num_image, h * w, -1)
+
+        # MLP layer to map the feature.
+        if self.grad_checkpointing:
+            from torch.utils.checkpoint import checkpoint
+            image_features = checkpoint(self.image_projector, image_features, use_reentrant=False)
+        else:
+            image_features = self.image_projector(image_features)
+
+        # image_features: (batch_size, num_image, num_patch, d_model)
+        # cls_embed: (batch_size, num_image, d_model)
+        return image_features, cls_embed
+
+
+class ModuleType(str, Enum):
+    in_module = "in"
+    out_module = "out"
+    emb = "emb"
+    final_out = "final_out"
+
+
+def init_weights(
+    config: FullMolmoConfig,
+    module: Union[nn.Linear, nn.Embedding],
+    d: Optional[int] = None,
+    layer_id: Optional[int] = None,
+    std_factor: float = 1.0,
+    type_of_module: Optional[ModuleType] = None,
+) -> None:
+    d = d if d is not None else config.d_model
+    std = config.init_std * std_factor
+    if config.init_cutoff_factor is not None:
+        cutoff_value = config.init_cutoff_factor * std
+        nn.init.trunc_normal_(module.weight, mean=0.0, std=std, a=-cutoff_value, b=cutoff_value)
+    else:
+        nn.init.normal_(module.weight, mean=0.0, std=std)
+
+
+class LlamaSwiGLU(nn.Module):
+    def forward(self, x1: torch.Tensor, x2: torch.Tensor) -> torch.Tensor:
+        return F.silu(x1) * x2
+
+    @property
+    def output_multiplier(self) -> float:
+        return 0.5
+
+
+class SwiGLU(nn.Module):
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        x, gate = x.chunk(2, dim=-1)
+        return F.silu(gate) * x
+
+    @property
+    def output_multiplier(self) -> float:
+        return 0.5
+
+
+class Activation(nn.Module):
+    def __init__(self, config: FullMolmoConfig):
+        super().__init__()
+        self.config = config
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        raise NotImplementedError
+
+    @property
+    def output_multiplier(self) -> float:
+        raise NotImplementedError
+
+    @classmethod
+    def build(cls, config: FullMolmoConfig) -> 'Activation':
+        if config.activation_type == "quick_gelu":
+            return QuickGELU(config)
+        elif config.activation_type == "gelu":
+            return cast(Activation, GELU(approximate="none"))
+        elif config.activation_type == "gelu_tanh":
+            return cast(Activation, GELU(approximate="tanh"))
+        elif config.activation_type == "relu":
+            return cast(Activation, ReLU(inplace=False))
+        elif config.activation_type == "silu":
+            return cast(Activation, SiLU(inplace=False))
+        # elif config.activation_type == "llama_geglu":
+        #     return LlamaGEGLU(config)
+        # elif config.activation_type == "llama_geglu_tanh":
+        #     return LlamaGEGLUTanh(config)
+        elif config.activation_type == "llama_swiglu":
+            return LlamaSwiGLU()
+        elif config.activation_type == "swiglu":
+            return SwiGLU()
+        else:
+            raise NotImplementedError(f"Unknown activation: '{config.activation_type}'")
+
+
+class QuickGELU(Activation):
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        return x * torch.sigmoid(1.702 * x)
+
+    @property
+    def output_multiplier(self) -> float:
+        return 1.0
+
+
+class GELU(nn.GELU):
+    @property
+    def output_multiplier(self) -> float:
+        return 1.0
+
+
+class ReLU(nn.ReLU):
+    @property
+    def output_multiplier(self) -> float:
+        return 1.0
+
+
+class SiLU(nn.SiLU):
+    @property
+    def output_multiplier(self) -> float:
+        return 1.0
+
+
+def causal_attention_bias(seq_len: int, device: torch.device) -> torch.FloatTensor:
+    att_bias = torch.triu(
+        torch.ones(seq_len, seq_len, device=device, dtype=torch.float),
+        diagonal=1,
+    )
+    att_bias.masked_fill_(att_bias == 1, torch.finfo(att_bias.dtype).min)
+    return att_bias.view(1, 1, seq_len, seq_len)  # type: ignore
+
+
+def get_causal_attention_bias(cache: BufferCache, seq_len: int, device: torch.device) -> torch.Tensor:
+    if (causal_bias := cache.get("causal_attention_bias")) is not None and causal_bias.shape[-1] >= seq_len:
+        if causal_bias.device != device:
+            causal_bias = causal_bias.to(device)
+            cache["causal_attention_bias"] = causal_bias
+        return causal_bias
+    with torch.autocast(device.type, enabled=False):
+        causal_bias = causal_attention_bias(seq_len, device)
+    cache["causal_attention_bias"] = causal_bias
+    return causal_bias
+
+
+class LayerNormBase(nn.Module):
+    def __init__(
+        self,
+        config: MolmoConfig,
+        *,
+        size: Optional[int] = None,
+        elementwise_affine: Optional[bool] = True,
+        eps: float = 1e-05,
+        weight_initializer: Optional[Callable] = torch.ones,
+        bias_initializer: Optional[Callable] = torch.zeros,
+    ):
+        super().__init__()
+        self.config = config
+        self.eps = self.config.layer_norm_eps or eps
+        self.normalized_shape = (size or config.d_model,)
+        if elementwise_affine or (elementwise_affine is None and self.config.layer_norm_with_affine):
+            self.weight = nn.Parameter(weight_initializer(self.normalized_shape, device=config.init_device))
+            use_bias = self.config.bias_for_layer_norm
+            if use_bias is None:
+                use_bias = self.config.include_bias
+            if use_bias:
+                self.bias = nn.Parameter(bias_initializer(self.normalized_shape, device=config.init_device))
+            else:
+                self.register_parameter("bias", None)
+        else:
+            self.register_parameter("bias", None)
+            self.register_parameter("weight", None)
+
+    @classmethod
+    def build(cls, config: FullMolmoConfig, size: Optional[int] = None, **kwargs):
+        if config.layer_norm_type == "default":
+            return LayerNorm(config, size=size, low_precision=False, **kwargs)
+        elif config.layer_norm_type == "low_precision":
+            return LayerNorm(config, size=size, low_precision=True, **kwargs)
+        elif config.layer_norm_type == "rms":
+            return RMSLayerNorm(config, size=size, **kwargs)
+        else:
+            raise NotImplementedError(f"Unknown LayerNorm type: '{config.layer_norm_type}'")
+
+
+class RMSLayerNorm(LayerNormBase):
+    """
+    RMS layer norm, a simplified :class:`LayerNorm` implementation
+    """
+
+    def __init__(
+        self,
+        config: FullMolmoConfig,
+        size: Optional[int] = None,
+        elementwise_affine: Optional[bool] = None,
+        eps: float = 1e-5,
+    ):
+        super().__init__(config, size=size, elementwise_affine=elementwise_affine, eps=eps)
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        with torch.autocast(enabled=False, device_type=x.device.type):
+            og_dtype = x.dtype
+            x = x.to(torch.float32)
+            variance = x.pow(2).mean(-1, keepdim=True)
+            x = x * torch.rsqrt(variance + self.eps)
+            x = x.to(og_dtype)
+
+        if self.weight is not None:
+            if self.bias is not None:
+                return self.weight * x + self.bias
+            else:
+                return self.weight * x
+        else:
+            return x
+
+
+class LayerNorm(LayerNormBase):
+    """
+    The default :class:`LayerNorm` implementation which can optionally run in low precision.
+    """
+
+    def __init__(
+        self,
+        config: FullMolmoConfig,
+        size: Optional[int] = None,
+        low_precision: bool = False,
+        elementwise_affine: Optional[bool] = None,
+        eps: float = 1e-05,
+    ):
+        super().__init__(config, size=size, elementwise_affine=elementwise_affine, eps=eps)
+        self.low_precision = low_precision
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        if self.low_precision:
+            module_device = x.device
+            downcast_x = self._cast_if_autocast_enabled(x)
+            downcast_weight = (
+                self._cast_if_autocast_enabled(self.weight) if self.weight is not None else self.weight
+            )
+            downcast_bias = self._cast_if_autocast_enabled(self.bias) if self.bias is not None else self.bias
+            with torch.autocast(enabled=False, device_type=module_device.type):
+                return F.layer_norm(
+                    downcast_x, self.normalized_shape, weight=downcast_weight, bias=downcast_bias, eps=self.eps
+                )
+        else:
+            return F.layer_norm(x, self.normalized_shape, weight=self.weight, bias=self.bias, eps=self.eps)
+
+
+class Molmo(nn.Module):
+    def __init__(self, config: FullMolmoConfig, init_params: bool = True):
+        super().__init__()
+        self.config = config
+        self.__cache = BufferCache()
+
+        # Validate config.
+        if self.config.embedding_size is not None and self.config.embedding_size != self.config.vocab_size:
+            if self.config.embedding_size < self.config.vocab_size:
+                raise MolmoConfigurationError("embedding size should be at least as big as vocab size")
+            elif self.config.embedding_size % 128 != 0:
+                import warnings
+
+                warnings.warn(
+                    "Embedding size is not a multiple of 128! This could hurt throughput performance.", UserWarning
+                )
+        torch.backends.cuda.enable_flash_sdp(True)
+        torch.backends.cuda.enable_mem_efficient_sdp(False)  # this is super slow so make sure torch won't use it
+
+        wte = None
+        if self.config.additional_vocab_size is not None:
+            wte = Embedding(
+                config.embedding_size or config.vocab_size,
+                config.additional_vocab_size,
+                config.d_model,
+                device=config.init_device,
+                initializer_range=config.initializer_range,
+                new_embed_initializer_range=config.new_embedding_init_range
+            )
+        else:
+            wte=nn.Embedding(
+                config.embedding_size or config.vocab_size, config.d_model, device=config.init_device
+            )
+
+        self.transformer = nn.ModuleDict(
+            dict(
+                wte=wte,
+                emb_drop=Dropout(config.embedding_dropout),
+                ln_f=LayerNorm.build(config),
+            )
+        )
+
+        blocks = [MolmoBlock.build(i, config, self.__cache) for i in range(config.n_layers)]
+        if self.config.block_group_size > 1:
+            raise NotImplementedError()
+        else:
+            self.transformer.update({"blocks": nn.ModuleList(blocks)})
+
+        if not self.config.rope:
+            self.transformer.update(
+                {"wpe": nn.Embedding(config.max_sequence_length, config.d_model, device=config.init_device)}
+            )
+        if not config.weight_tying:
+            self.transformer.update(
+                {
+                    "ff_out": nn.Linear(
+                        config.d_model,
+                        config.embedding_size or config.vocab_size,
+                        bias=config.include_bias,
+                        device=config.init_device,
+                        )
+                }
+            )
+
+        self.vision_backbone: Optional[OLMoVisionBackbone] = None
+        if config.vision_backbone is not None:
+            self.vision_backbone = OLMoPretrainedVisionBackbone(config)
+
+        self.__num_fwd_flops: Optional[int] = None
+
+    def reset_parameters(self):
+        if self.vision_backbone is not None:
+            self.vision_backbone.reset_parameters()
+        self.reset_non_vision_parameters()
+
+    def reset_non_vision_parameters(self):
+        self.transformer.wte.reset_parameters()
+        if hasattr(self.transformer.wte, "new_embedding"):
+            nn.init.normal_(self.transformer.wte.new_embedding, std=self.config.new_embedding_init_range)
+
+        if hasattr(self.transformer, "wpe"):
+            nn.init.normal_(self.transformer.wpe, mean=0.0, std=1.0)
+
+        self.transformer.ln_f.reset_parameters()  # type: ignore
+
+        if hasattr(self.transformer, "ff_out"):
+            nn.init.normal_(self.transformer.ff_out, mean=0.0, std=0.02)
+
+        if self.config.block_group_size == 1:
+            for block in self.transformer.blocks:
+                block.reset_parameters()
+        else:
+            for block_group in self.transformer.block_groups:
+                block_group.reset_parameters()
+
+
+    def forward(
+        self,
+        input_ids: torch.LongTensor,
+        input_embeddings: Optional[torch.FloatTensor] = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        attention_bias: Optional[torch.Tensor] = None,
+        response_mask: Optional[torch.Tensor] = None,
+        images: Optional[torch.Tensor] = None,
+        image_masks: Optional[torch.Tensor] = None,
+        image_input_idx: Optional[torch.Tensor] = None,
+        subsegment_ids: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.Tensor] = None,
+        past_key_values: Optional[Sequence[Tuple[torch.Tensor, torch.Tensor]]] = None,
+        use_cache: bool = False,
+        last_logits_only: bool = False,
+        output_hidden_states: Optional[bool] = None,
+        append_last_valid_logits: Optional[torch.Tensor] = None,
+    ) -> ModelOutput:
+        """
+        :param input_ids: A tensor of shape `(batch_size, seq_len)`.
+        :param input_embeddings: A tensor of shape `(batch_size, seq_len, d_model)` with input
+            embeddings. When provided, it is treated as the output of the input embedding layer.
+        :param attention_mask: A tensor of shape `(batch_size, seq_len)` that indicates
+            which input IDs are masked. A `1` value in the mask means that
+            the corresponding input ID should *not* be ignored. A `0` means
+            that the corresponding input ID is masked.
+
+            This has the same meaning as the `attention_mask` in HuggingFace's `transformers`
+            library.
+        :param attention_bias: A tensor of shape `(batch_size, 1, seq_len, seq_len)`,
+            `(1, 1, seq_len, seq_len)`, or `(seq_len, seq_len)`. This is used
+            to introduce causal or other biases.
+
+            If the tensor is a bool or byte tensor, a `True` or `1` at `attention_bias[:, :, i, j]`
+            indicates that the i-th element in the sequence is allowed to attend to the j-th
+            element in the sequence.
+
+            If the tensor is a float tensor, it will just be added to the attention
+            scores before the softmax.
+
+            The default is causal, which corresponds to a lower-diagonal byte matrix of ones.
+        :param response_mask: A tensor of shape `(batch_size, seq_len)` that indicates
+            the response mask. A `1` value in the mask means that the corresponding token
+            is a response token. A `0` means that the corresponding token is not
+            a response token.
+        :param past_key_values: Pre-computed keys and values for each attention block.
+            Can be used to speed up sequential decoding. The `input_ids` which have
+            their past given to this model should not be passed as `input_ids` as they have already been computed.
+        :param use_cache: If `True`, return key and value tensors for each block.
+        :param last_logits_only: If `True`, only compute the logits for the last token of each sequence.
+            This can speed up decoding when you only care about the next token.
+        """
+        output_hidden_states = output_hidden_states if output_hidden_states is not None else False
+
+        if past_key_values:
+            assert len(past_key_values) == self.config.n_layers
+
+        has_image = images is not None
+
+        assert not (has_image and input_embeddings is not None), "Cannot provide both images and input embeddings."
+        assert not (has_image and past_key_values is not None), "Cached key and values should not be used with images."
+
+        batch_size, seq_len = input_ids.size() if input_embeddings is None else input_embeddings.size()[:2]
+        if past_key_values is None:
+            past_length = 0
+        else:
+            past_length = past_key_values[0][0].size(-2)
+
+        if self.config.use_position_ids and attention_mask is None:
+            attention_mask = input_ids != -1
+
+        if subsegment_ids is not None:
+            assert not use_cache, "Subsegment_ids cannot be used with cache."
+            subsegment_mask = subsegment_ids.unsqueeze(2) <= subsegment_ids.unsqueeze(1)
+            attention_mask = (
+                subsegment_mask.to(attention_mask.dtype) *
+                attention_mask.unsqueeze(2) *
+                attention_mask.unsqueeze(1))
+            if position_ids is None:
+                raise ValueError(f"Positioned ids must be given if using subsegment_ids")
+        else:
+            if self.config.use_position_ids and position_ids is None:
+                position_ids = torch.clamp(
+                    torch.cumsum(attention_mask.to(torch.int32), dim=-1) - 1,
+                    min=0,
+                    ).broadcast_to((batch_size, attention_mask.shape[-1]))
+
+        # Get embeddings of input.
+        # shape: (batch_size, seq_len, d_model)
+        if input_ids is not None:
+            input_ids = input_ids * (input_ids != -1).to(input_ids.dtype)
+        x = self.transformer.wte(input_ids) if input_embeddings is None else input_embeddings  # type: ignore
+
+        num_image: Optional[int] = None
+        if images is not None:
+            # shape: (batch_size, num_image, num_patch, d_model)
+            # cls_embed: (batch_size, num_image, d_model)
+            image_features, cls_embed = self.vision_backbone(images, image_masks)
+            num_image, num_patch = image_features.shape[1:3]
+            assert image_input_idx.shape == (batch_size, num_image, num_patch)
+
+            # inster the image feature into the embedding.
+            image_features = image_features.view(batch_size, num_image * num_patch, -1)
+            image_input_idx = image_input_idx.view(batch_size, num_image * num_patch)
+
+            valid = image_input_idx >= 0
+            batch_idx = torch.arange(batch_size, device=x.device)
+            batch_idx = torch.tile(batch_idx[:, None], [1, image_features.shape[1]])
+
+            # For hf demo/endpoint
+            image_features = image_features.to(x.device)
+
+            x[batch_idx[valid], image_input_idx[valid]] += image_features[valid]
+
+        if not self.config.rope:
+            # Get positional embeddings.
+            # shape: (1, seq_len)
+            pos = torch.arange(past_length, past_length + seq_len, dtype=torch.long, device=x.device).unsqueeze(0)
+            # shape: (1, seq_len, d_model)
+            pos_emb = self.transformer.wpe(pos)  # type: ignore
+            x = pos_emb + x
+
+        # Add input + positional embeddings and apply dropout.
+        # shape: (batch_size, seq_len, d_model)
+        x = self.transformer.emb_drop(x)  # type: ignore
+
+        # normalized
+        if self.config.normalize_input_embeds:
+            x = x * (self.config.d_model ** 0.5)
+
+        # Transform the attention mask into what the blocks expect.
+        if attention_mask is not None:
+            # shape: (batch_size, 1, 1, seq_len)
+            if len(attention_mask.shape) == 2:
+                attention_mask = attention_mask[:, :past_length + seq_len]
+                attention_mask = attention_mask.to(dtype=torch.float).view(batch_size, -1)[:, None, None, :]
+            else:
+                attention_mask = attention_mask.unsqueeze(1).to(dtype=torch.float)
+            attention_mask = (1.0 - attention_mask) * torch.finfo(attention_mask.dtype).min
+
+        # Merge attention mask with attention bias.
+        if (
+            attention_bias is not None
+            or attention_mask is not None
+            # NOTE (epwalsh): we need to initialize the attn bias in order for attn to work properly
+            # with key+value cache. Otherwise `F.scaled_dot_product_attention()` doesn't seem to compute
+            # scores correctly.
+            or past_key_values is not None
+        ):
+            if attention_bias is None:
+                attention_bias = get_causal_attention_bias(self.__cache, past_length + seq_len, x.device)
+            elif attention_bias.dtype in (torch.int8, torch.bool):
+                attention_bias = attention_bias.to(dtype=torch.float)
+                attention_bias.masked_fill_(attention_bias == 0.0, torch.finfo(attention_bias.dtype).min)
+
+            # Transform to the right shape and data type.
+            mask_len = seq_len
+            if attention_mask is not None:
+                mask_len = attention_mask.shape[-1]
+            elif past_key_values is not None:
+                mask_len = past_key_values[0][0].shape[-2] + seq_len
+            attention_bias = attention_bias[:, :, :mask_len, :mask_len].to(dtype=torch.float)
+
+            # Add in the masking bias.
+            if attention_mask is not None:
+                attention_bias = attention_bias + attention_mask
+                # Might get -infs after adding attention mask, since dtype.min + dtype.min = -inf.
+                # `F.scaled_dot_product_attention()` doesn't handle -inf like you'd expect, instead
+                # it can produce NaNs.
+                ensure_finite_(attention_bias, check_neg_inf=True, check_pos_inf=False)
+
+        attn_key_values: Optional[List[Tuple[torch.Tensor, torch.Tensor]]] = [] if use_cache else None
+
+        # decoder layers
+        all_hidden_states = []
+
+        # Apply blocks one-by-one.
+        if self.config.block_group_size == 1:
+            for block_idx, block in enumerate(self.transformer.blocks):
+                if output_hidden_states:
+                    # add hidden states
+                    all_hidden_states.append(x)
+
+                layer_past = None if past_key_values is None else past_key_values[block_idx]
+                x, cache = block(x, attention_bias=attention_bias, position_ids=position_ids, layer_past=layer_past, use_cache=use_cache)
+
+                if attn_key_values is not None:
+                    assert cache is not None
+                    attn_key_values.append(cache)
+        else:
+            for group_idx, block_group in enumerate(self.transformer.block_groups):
+                if output_hidden_states:
+                    # add hidden states
+                    all_hidden_states.append(x)
+
+                layers_past = (
+                    None
+                    if past_key_values is None
+                    else past_key_values[
+                         group_idx * self.config.block_group_size : (group_idx + 1) * self.config.block_group_size
+                         ]
+                )
+                x, cache = block_group(
+                    x, attention_bias=attention_bias, position_ids=position_ids, layers_past=layers_past, use_cache=use_cache
+                )
+                if attn_key_values is not None:
+                    assert cache is not None
+                    attn_key_values.extend(cache)
+
+        if last_logits_only:
+            # shape: (batch_size, 1, d_model)
+            if append_last_valid_logits is not None:
+                last_valid_output = x[
+                    torch.arange(x.shape[0], device=x.device), append_last_valid_logits.to(x.device)]
+                x = last_valid_output.unsqueeze(1)
+            else:
+                x = x[:, -1, :].unsqueeze(1)
+
+        # Apply final layer norm.
+        # shape: (batch_size, seq_len or 1, d_model)
+        x = self.transformer.ln_f(x)  # type: ignore
+        if output_hidden_states:
+            # add final hidden state post-final-layernorm, following HuggingFace's convention
+            all_hidden_states.append(x)
+
+        # Get logits.
+        # shape: (batch_size, seq_len or 1, vocab_size)
+        if self.config.weight_tying:
+            logits = F.linear(x, self.transformer.wte.weight, None)  # type: ignore
+        else:
+            logits = self.transformer.ff_out(x)  # type: ignore
+        if self.config.scale_logits:
+            logits.mul_(1 / math.sqrt(self.config.d_model))
+
+        if not last_logits_only and append_last_valid_logits is not None:
+            last_valid_logit = logits[
+                torch.arange(logits.shape[0], device=logits.device), append_last_valid_logits]
+            logits = torch.cat([logits[:, :-1], last_valid_logit[:, None]], dim=1)
+
+        return ModelOutput(logits=logits, attn_key_values=attn_key_values, hidden_states=tuple(all_hidden_states) if output_hidden_states else None)  # type: ignore[arg-type]
+
+
+class MolmoForCausalLM(PreTrainedModel):
+    config_class = MolmoConfig
+    base_model_prefix = "model"
+    _no_split_modules = ["MolmoBlock"]
+
+    def __init__(self, config: MolmoConfig, model: Optional[Molmo] = None, init_params: bool = False):
+        super().__init__(config)
+
+        if not model:
+            full_config = FullMolmoConfig(
+                image_padding_embed="pad_and_partial_pad",
+                image_pooling_2d="attention-meanq",
+                attention_layer_norm=config.attention_layer_norm,
+                rope_impl="llama",
+                vocab_size=config.vocab_size,
+                max_sequence_length=config.max_position_embeddings,
+                qkv_bias=config.qkv_bias,
+                norm_after=config.norm_after,
+                embedding_size=config.embedding_size,
+                attention_type="sdpa",
+                embedding_dropout=0,
+                attention_dropout=0,
+                residual_dropout=0,
+                rope=True,
+                weight_tying=False,
+                include_bias=False,
+                d_model=config.hidden_size,
+                mlp_hidden_size=config.intermediate_size,
+                n_layers=config.num_hidden_layers,
+                additional_vocab_size=128,
+                n_heads=config.num_attention_heads,
+                n_kv_heads=config.num_key_value_heads,
+                rope_theta=config.rope_theta,
+                layer_norm_eps=config.layer_norm_eps,
+                layer_norm_type=config.layer_norm_type,
+                vit_layers=[-2, -9],
+                vision_backbone=VisionBackboneConfig(
+                    image_default_input_size=(336, 336),
+                    image_patch_size=14,
+                    image_pos_patch_size=14,
+                    image_emb_dim=1024,
+                    image_num_heads=16,
+                    image_num_key_value_heads=16,
+                    image_num_layers=23,
+                    image_head_dim=64,
+                    image_mlp_dim=4096,
+                    image_mlp_activations="quick_gelu",
+                    image_dropout_rate=0.0,
+                    image_num_pos=577,
+                    image_norm_eps=1e-5,
+                    attention_dropout=0.0,
+                    residual_dropout=0.0,
+                    initializer_range=0.02,
+                )
+            )
+            self.model = Molmo(full_config, init_params=init_params)
+        else:
+            self.model = model
+
+
+    def forward(
+        self,
+        input_ids: torch.LongTensor = None,
+        inputs_embeds: Optional[torch.FloatTensor] = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        attention_bias: Optional[torch.Tensor] = None,
+        response_mask: Optional[torch.Tensor] = None,
+        images: Optional[torch.Tensor] = None,
+        image_masks: Optional[torch.Tensor] = None,
+        image_input_idx: Optional[torch.Tensor] = None,
+        subsegment_ids: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.Tensor] = None,
+        past_key_values: Optional[List[torch.FloatTensor]] = None,
+        labels: Optional[torch.LongTensor] = None,
+        loss_masks: Optional[torch.Tensor] = None,
+        use_cache: Optional[bool] = None,
+        last_logits_only: Optional[bool] = None,
+        output_attentions: Optional[bool] = None,
+        output_hidden_states: Optional[bool] = None,
+        append_last_valid_logits: Optional[torch.Tensor] = None,
+        return_dict: Optional[bool] = None,
+        cache_position: Optional[
+            Cache
+        ] = None,  # This is a hack mitigation of an issue in transformers `4.39.x` https://github.com/huggingface/transformers/issues/29426
+    ) -> Union[Tuple, CausalLMOutputWithPast]:
+        if use_cache is None:
+            use_cache = self.config.use_cache
+
+        if output_attentions:
+            raise ValueError("output_attentions is not yet supported in Molmo")
+
+        return_dict = return_dict if return_dict is not None else self.config.use_return_dict
+
+        # decoder outputs consists of (dec_features, layer_state, dec_hidden, dec_attn)
+        outputs = self.model.forward(
+            input_ids=input_ids,
+            input_embeddings=inputs_embeds,
+            attention_mask=attention_mask,
+            attention_bias=attention_bias,
+            response_mask=response_mask,
+            images=images,
+            image_masks=image_masks,
+            image_input_idx=image_input_idx,
+            subsegment_ids=subsegment_ids,
+            position_ids=position_ids,
+            past_key_values=past_key_values,
+            use_cache=use_cache,
+            last_logits_only=last_logits_only,
+            output_hidden_states=output_hidden_states,
+            append_last_valid_logits=append_last_valid_logits,
+        )
+
+        logits = outputs.logits
+        hidden_states = outputs.hidden_states
+
+        loss = None
+        if labels is not None:
+            if loss_masks is not None:
+                loss_masks = loss_masks * (loss_masks > 0)
+                batch_size_in_tokens = max(loss_masks.sum().item(), 1)
+                labels = labels.long()
+                labels.masked_fill_(~(loss_masks > 0), -100)
+                labels = labels.view(-1)
+                logits_for_loss = logits.to(torch.float32).view(-1, logits.size(-1))
+                loss_fct = torch.nn.CrossEntropyLoss(ignore_index=-100, reduction='none')
+                loss = loss_fct(logits_for_loss, labels)
+                loss = loss.view(input_ids.shape[0], -1)
+                loss = loss * loss_masks
+                loss = loss.sum() / batch_size_in_tokens
+                use_zloss = getattr(self.config, "softmax_auxiliary_loss", False)
+                if use_zloss:
+                    z_squared = logits_for_loss.logsumexp(-1).pow(2)
+                    z_loss = self.config.softmax_auxiliary_loss_scale * z_squared
+                    z_loss = z_loss.view(input_ids.shape[0], -1)
+                    z_loss = z_loss * loss_masks
+                    z_loss = z_loss.sum() / batch_size_in_tokens
+                    loss += z_loss
+            else:
+                # Shift so that tokens < n predict n
+                shift_logits = logits[..., :-1, :].contiguous()
+                shift_labels = labels[..., 1:].contiguous()
+                # Flatten the tokens
+                loss_fct = torch.nn.CrossEntropyLoss()
+                shift_logits = shift_logits.view(-1, self.config.embedding_size)
+                shift_labels = shift_labels.view(-1)
+                # Enable model parallelism
+                shift_labels = shift_labels.to(shift_logits.device)
+                loss = loss_fct(shift_logits, shift_labels)
+
+        if not return_dict:
+            output = (logits,) + outputs[1:]
+            return (loss,) + output if loss is not None else output
+
+        return CausalLMOutputWithPast(
+            loss=loss,
+            logits=logits,
+            past_key_values=outputs.attn_key_values,
+            hidden_states=hidden_states,
+        )
+
+    def can_generate(self) -> bool:
+        return True
+
+    @torch.no_grad()
+    def generate_from_batch(
+        self,
+        batch: Dict[str, Any],
+        generation_config: Optional[GenerationConfig] = None,
+        **kwargs,
+    ):
+        if generation_config is not None:
+            assert generation_config.use_cache
+
+        images = batch.get("images")
+        image_masks = batch.get("image_masks")
+        image_input_idx = batch.get("image_input_idx")
+
+        # Validate inputs.
+        input_ids = batch["input_ids"]
+        batch_size, seq_len = input_ids.shape
+        attention_mask = batch.get("attention_mask", None)
+        max_new_tokens = generation_config.max_new_tokens
+        assert max_new_tokens is not None
+        mask_len = seq_len + max_new_tokens if self.config.use_position_ids else seq_len
+        position_ids: Optional[torch.Tensor] = None
+        append_last_valid_logits: Optional[torch.Tensor] = None
+        if self.config.use_position_ids and attention_mask is None:
+            attention_mask = input_ids != -1
+            position_ids = torch.clamp(
+                torch.cumsum(attention_mask.to(torch.int32), dim=-1) - 1,
+                min=0
+            )
+            append_last_valid_logits = attention_mask.long().sum(dim=-1) - 1
+            attention_mask = torch.cat(
+                [attention_mask, attention_mask.new_ones((batch_size, max_new_tokens))],
+                dim=1,
+            )
+        if attention_mask is not None:
+            assert attention_mask.shape == (batch_size, mask_len)
+
+        out = super().generate(
+            batch["input_ids"],
+            generation_config,
+            attention_mask=attention_mask,
+            images=images,
+            image_masks=image_masks,
+            image_input_idx=image_input_idx,
+            position_ids=position_ids,
+            append_last_valid_logits=append_last_valid_logits,
+            **kwargs,
+        )
+
+        return out
+
+    def prepare_inputs_for_generation(
+        self, input_ids: torch.LongTensor, past_key_values: Optional[List[Tuple]] = None, **kwargs
+    ):
+        if past_key_values:
+            # This is because we want the model to only process the last generated token.
+            input_ids = input_ids[:, -1:]
+
+        if self.config.use_position_ids:
+            attention_mask = kwargs.get("attention_mask")
+            images = kwargs.get("images")
+            image_masks = kwargs.get("image_masks")
+            image_input_idx = kwargs.get("image_input_idx")
+            position_ids = kwargs.get("position_ids")
+            append_last_valid_logits = kwargs.get("append_last_valid_logits")
+            model_inputs = {
+                "input_ids": input_ids,
+                "attention_mask": attention_mask,
+                "position_ids": position_ids,
+                "past_key_values": past_key_values,
+                "use_cache": True,
+                "last_logits_only": True,
+            }
+            if past_key_values is None:
+                model_inputs["images"] = images
+                model_inputs["image_masks"] = image_masks
+                model_inputs["image_input_idx"] = image_input_idx
+                model_inputs["append_last_valid_logits"] = append_last_valid_logits
+        else:
+            model_inputs = {"input_ids": input_ids, "past_key_values": past_key_values}
+
+            model_inputs.update(kwargs)
+            model_inputs["use_cache"] = kwargs.pop("use_cache", self.config.use_cache)
+        return model_inputs
+
+    def _update_model_kwargs_for_generation(
+        self,
+        outputs: ModelOutput,
+        model_kwargs: Dict[str, Any],
+        is_encoder_decoder: bool = False,
+        num_new_tokens: int = 1,
+    ) -> Dict[str, Any]:
+        if self.config.use_position_ids:
+            model_kwargs["position_ids"] = model_kwargs["position_ids"][:, -1:] + 1
+            if "append_last_valid_logits" in model_kwargs:
+                del model_kwargs["append_last_valid_logits"]
+            if "images" in model_kwargs:
+                del model_kwargs["images"]
+                del model_kwargs["image_masks"]
+                del model_kwargs["image_input_idx"]
+        cache_name, cache = super()._extract_past_from_model_output(outputs)
+        try:
+            cache_name, cache = super()._extract_past_from_model_output(outputs)
+        except AttributeError:
+            past_key_values = outputs.past_key_values if "past_key_values" in outputs else None
+            cache_name, cache = "past_key_values", past_key_values
+        model_kwargs[cache_name] = cache
+        model_kwargs["cache_position"] = model_kwargs["cache_position"][-1:] + num_new_tokens
+        return model_kwargs
+
+    def get_input_embeddings(self) -> torch.nn.Module:
+        return self.model.transformer.wte
+
+    def set_input_embeddings(self, value: torch.nn.Module):
+        self.model.transformer.wte = value
+
+    def get_output_embeddings(self):
+        if self.config.weight_tying:
+            return self.model.transformer.wte
+        else:
+            return self.model.transformer.ff_out
+
+    def set_output_embeddings(self, value: torch.nn.Module):
+        if self.config.weight_tying:
+            self.model.transformer.wte = value
+        else:
+            self.model.transformer.ff_out = value
+
+    def tie_weights(self):
+        """
+        This function is intentionally left as a no-op.
+
+        Weight tying is handled as follows:
+        - When the model is initialized, the `ff_out` layer is conditionally defined based on the `weight_tying` configuration.
+        See: `if not config.weight_tying: self.transformer.update(...)` in `olmo/model.py`.
+        - When computing logits, the `wte` weights are used directly if `weight_tying` is enabled.
+        See: `if self.config.weight_tying: logits = F.linear(x, self.transformer.wte.weight, None)` in the `forward` method.
+
+        Therefore, there is no need to explicitly tie the weights in this function.
+        """
+        pass
+
+    def resize_token_embeddings(
+        self, new_num_tokens: Optional[int] = None, pad_to_multiple_of: Optional[int] = None
+    ) -> torch.nn.Embedding:
+        """
+        Resizes input token embeddings matrix of the model if `new_num_tokens != config.embedding_size`.
+
+        Takes care of tying weights embeddings afterwards if the model class has a `tie_weights()` method.
+
+        Arguments:
+            new_num_tokens (`int`, *optional*):
+                The new number of tokens in the embedding matrix. Increasing the size will add newly initialized
+                vectors at the end. Reducing the size will remove vectors from the end. If not provided or `None`, just
+                returns a pointer to the input tokens `torch.nn.Embedding` module of the model without doing anything.
+            pad_to_multiple_of (`int`, *optional*):
+                If set will pad the embedding matrix to a multiple of the provided value. If `new_num_tokens` is set to
+                `None` will just pad the embedding to a multiple of `pad_to_multiple_of`.
+
+                This is especially useful to enable the use of Tensor Cores on NVIDIA hardware with compute capability
+                `>= 7.5` (Volta), or on TPUs which benefit from having sequence lengths be a multiple of 128. For more
+                details about this, or help on choosing the correct value for resizing, refer to this guide:
+                https://docs.nvidia.com/deeplearning/performance/dl-performance-matrix-multiplication/index.html#requirements-tc
+
+        Return:
+            `torch.nn.Embedding`: Pointer to the input tokens Embeddings Module of the model.
+
+        Note:
+            This method differs from the base class implementation by resizing the `embedding_size` attribute of the
+            model configuration instead of the `vocab_size`. It also includes a warning if the resized `embedding_size`
+            is less than the `vocab_size`. In OLMo, `embedding_size` refers to the dimensionality of the model's token
+            embeddings, while `vocab_size` refers to the number of unique tokens in the vocabulary.
+        """
+        model_embeds = self._resize_token_embeddings(new_num_tokens, pad_to_multiple_of)
+        if new_num_tokens is None and pad_to_multiple_of is None:
+            return model_embeds
+
+        # Update base model and current model config
+        self.config.embedding_size = model_embeds.weight.shape[0]
+        self.model.config.embedding_size = model_embeds.weight.shape[0]
+
+        # Check if the embedding size is less than the vocab size
+        if self.config.embedding_size < self.config.vocab_size:
+            warning_message = (
+                f"Resizing token embeddings to size {self.config.embedding_size}, which is less than the vocab size "
+                f"{self.config.vocab_size} defined in the model configuration. Make sure your tokenizer's vocabulary "
+                "size is less than or equal to the new token embedding size."
+            )
+            log.warning(warning_message)
+
+        # Tie weights again if needed
+        self.tie_weights()
+
+        return model_embeds
+
+
+# Always register for multi-modal features
+AutoModelForCausalLM.register(MolmoConfig, MolmoForCausalLM)

preprocessing_molmo.py

@@ -0,0 +1,192 @@
+"""
+Processor class for Molmo.
+"""
+
+from typing import Optional
+
+import PIL
+from PIL import ImageOps
+from PIL.Image import Image
+
+try:
+    from typing import Unpack
+except ImportError:
+    from typing_extensions import Unpack
+
+import numpy as np
+import torch
+
+from transformers.image_utils import ImageInput
+from transformers.processing_utils import (
+    TextKwargs,
+    ProcessingKwargs,
+    ProcessorMixin,
+)
+
+from transformers.tokenization_utils_base import TextInput, PreTokenizedInput
+from transformers.utils import logging
+
+from transformers import AutoTokenizer
+from .image_preprocessing_molmo import MolmoImagesKwargs, MolmoImageProcessor
+
+
+logger = logging.get_logger(__name__)
+
+
+DEFAULT_IMAGE_PATCH_TOKEN = f"<im_patch>"
+DEFAULT_IM_START_TOKEN = f"<im_start>"
+DEFAULT_IM_END_TOKEN = f"<im_end>"
+DEFAULT_IM_COL_TOKEN = f"<im_col>"
+IMAGE_PROMPT = "<|image|>"
+
+EXTRA_TOKENS = (DEFAULT_IM_START_TOKEN, DEFAULT_IM_END_TOKEN, DEFAULT_IMAGE_PATCH_TOKEN, DEFAULT_IM_COL_TOKEN, IMAGE_PROMPT)
+
+
+def get_special_token_ids(tokenizer):
+    ids = tokenizer.encode("".join(EXTRA_TOKENS), add_special_tokens=False)
+    assert len(ids) == len(EXTRA_TOKENS)
+    return {k: i for k, i in zip(EXTRA_TOKENS, ids)}
+
+
+class MolmoTextKwargs(TextKwargs, total=False):
+    style: Optional[str]
+    system_prompt: Optional[str]
+    message_format: Optional[str]
+    always_start_with_space: Optional[bool]
+    sequence_length: Optional[int]
+
+
+class MolmoProcessorKwargs(ProcessingKwargs, total=False):
+    text_kwargs: MolmoTextKwargs
+    images_kwargs: MolmoImagesKwargs
+    _defaults = {
+        "images_kwargs": {
+            "max_crops": 12,
+            "overlap_margins": [4, 4],
+            "base_image_input_size": [336, 336],
+            "image_token_length_w": 12,
+            "image_token_length_h": 12,
+            "image_patch_size": 14,
+            "image_padding_mask": True,
+        },
+        "text_kwargs": {
+            "style": "long_caption",
+            "system_prompt": "none",
+            "message_format": "role",
+            "always_start_with_space": True,
+            "sequence_length": 1536,
+            "padding": False,
+        },
+    }
+
+
+class MolmoProcessor(ProcessorMixin):
+    attributes = ["image_processor", "tokenizer"]
+    image_processor_class = "AutoImageProcessor"
+    tokenizer_class = ("GPT2Tokenizer", "GPT2TokenizerFast")
+
+    def __init__(self, image_processor: MolmoImageProcessor = None, tokenizer : AutoTokenizer = None, **kwargs):
+        # self.image_processor = image_processor
+        # self.tokenizer = tokenizer
+        super().__init__(image_processor, tokenizer)
+        self._special_tokens = None
+
+    @property
+    def special_token_ids(self):
+        if self._special_tokens is None:
+            self._special_tokens = get_special_token_ids(self.tokenizer)
+        return self._special_tokens
+
+    def get_tokens_input(self, prompt, message_format, always_start_with_space):
+        if message_format == "none" or message_format is None:
+            pass
+        elif message_format == "role":
+            prompt = "User: " + prompt + " Assistant:"
+        else:
+            raise NotImplementedError(f"Message format {message_format} not implemented")
+
+        if always_start_with_space:
+            prompt = " " + prompt
+
+        tokens = self.tokenizer.encode(prompt, add_special_tokens=False)
+
+        return tokens
+
+    def process(
+        self,
+        text: TextInput = None,
+        images: ImageInput = None,
+        *,
+        tokens: Optional[PreTokenizedInput] = None,
+        **kwargs: Unpack[MolmoProcessorKwargs],
+    ):
+        output_kwargs = self._merge_kwargs(
+            MolmoProcessorKwargs,
+            tokenizer_init_kwargs=self.tokenizer.init_kwargs,
+            **kwargs,
+        )
+
+        if tokens is None:
+            tokens = self.get_tokens_input(
+                text,
+                output_kwargs["text_kwargs"]["message_format"],
+                output_kwargs["text_kwargs"]["always_start_with_space"],
+            )
+
+        image_token_id = self.special_token_ids[IMAGE_PROMPT]
+
+        if images is not None:
+            if not isinstance(images, (list, tuple)):
+                images = [images]
+            image_arrays = []
+            for image in images:
+                if isinstance(image, Image):
+                    image = image.convert("RGB")
+                    # Handle images with EXIF orientation tags, which PIL will ignore by default
+                    # https://github.com/python-pillow/Pillow/issues/4703
+                    img = ImageOps.exif_transpose(image)
+                    image_arrays.append(np.array(image))
+                else:
+                    assert len(image.shape) == 3 and image.shape[-1] == 3
+                    image_arrays.append(image.astype(np.uint8))
+            images = image_arrays
+            # For now only support inserting images at the start
+            image_idx = [-1]*len(images)
+        else:
+            image_idx = None
+
+        sequence_length = output_kwargs["text_kwargs"]["sequence_length"]
+
+        image_patch_token_id = self.special_token_ids[DEFAULT_IMAGE_PATCH_TOKEN]
+        image_col_token_id = self.special_token_ids[DEFAULT_IM_COL_TOKEN]
+        image_start_token_id = self.special_token_ids[DEFAULT_IM_START_TOKEN]
+        image_end_token_id = self.special_token_ids[DEFAULT_IM_END_TOKEN]
+        out = self.image_processor.multimodal_preprocess(
+            images=images,
+            image_idx=image_idx,
+            tokens=np.asarray(tokens).astype(np.int32),
+            sequence_length=sequence_length,
+            image_patch_token_id=image_patch_token_id,
+            image_col_token_id=image_col_token_id,
+            image_start_token_id=image_start_token_id,
+            image_end_token_id=image_end_token_id,
+            **output_kwargs["images_kwargs"]
+        )
+
+        # Prepend BOS
+        # qwen2 and olmo do not have a BOS, and instead use EOS as a generic seperator token.
+        bos = self.tokenizer.bos_token_id or self.tokenizer.eos_token_id
+        decoder_input_tokens = np.pad(out["input_ids"], [[1, 0]], constant_values=bos)
+        out["input_ids"] = decoder_input_tokens
+        if "image_input_idx" in out:
+            # Shift patch mapping up by one since we added BOS
+            image_input_idx = out["image_input_idx"]
+            out["image_input_idx"] = np.where(image_input_idx < 0, image_input_idx, image_input_idx + 1)
+
+        for k, v in out.items():
+            out[k] = torch.from_numpy(v)
+
+        return out
+
+
+MolmoProcessor.register_for_auto_class()

preprocessor_config.json

@@ -0,0 +1,32 @@
+{
+  "auto_map": {
+    "AutoImageProcessor": "image_preprocessing_molmo.MolmoImageProcessor",
+    "AutoProcessor": "preprocessing_molmo.MolmoProcessor"
+  },
+  "base_image_input_size": [
+    336,
+    336
+  ],
+  "do_normalize": true,
+  "image_mean": [
+    0.48145466,
+    0.4578275,
+    0.40821073
+  ],
+  "image_padding_mask": true,
+  "image_patch_size": 14,
+  "image_processor_type": "MolmoImageProcessor",
+  "image_std": [
+    0.26862954,
+    0.26130258,
+    0.27577711
+  ],
+  "image_token_length_h": 12,
+  "image_token_length_w": 12,
+  "max_crops": 12,
+  "overlap_margins": [
+    4,
+    4
+  ],
+  "processor_class": "MolmoProcessor"
+}

quantization_config.json

@@ -0,0 +1,19 @@
+{
+  "add_skip_keys": false,
+  "dequantize_fp32": false,
+  "group_size": 0,
+  "is_integer": true,
+  "modules_dtype_dict": {},
+  "modules_to_not_convert": [],
+  "non_blocking": false,
+  "quant_conv": false,
+  "quant_method": "sdnq",
+  "quantization_device": null,
+  "return_device": null,
+  "svd_rank": 32,
+  "svd_steps": 8,
+  "use_quantized_matmul": false,
+  "use_quantized_matmul_conv": false,
+  "use_svd": false,
+  "weights_dtype": "int8"
+}

special_tokens_map.json

@@ -0,0 +1,37 @@
+{
+  "additional_special_tokens": [
+    "<im_start>",
+    "<im_end>",
+    "<im_patch>",
+    "<im_col>",
+    "<|image|>"
+  ],
+  "bos_token": {
+    "content": "<|endoftext|>",
+    "lstrip": false,
+    "normalized": false,
+    "rstrip": false,
+    "single_word": false
+  },
+  "eos_token": {
+    "content": "<|endoftext|>",
+    "lstrip": false,
+    "normalized": false,
+    "rstrip": false,
+    "single_word": false
+  },
+  "pad_token": {
+    "content": "<|pad|>",
+    "lstrip": false,
+    "normalized": false,
+    "rstrip": false,
+    "single_word": false
+  },
+  "unk_token": {
+    "content": "<|endoftext|>",
+    "lstrip": false,
+    "normalized": false,
+    "rstrip": false,
+    "single_word": false
+  }
+}

tokenizer_config.json

@@ -0,0 +1,240 @@
+{
+  "add_prefix_space": false,
+  "added_tokens_decoder": {
+    "100256": {
+      "content": "<|extra_id_0|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "100257": {
+      "content": "<|endoftext|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "100258": {
+      "content": "<|fim_prefix|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "100259": {
+      "content": "<|fim_middle|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "100260": {
+      "content": "<|fim_suffix|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "100261": {
+      "content": "|||PHONE_NUMBER|||",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "100262": {
+      "content": "|||EMAIL_ADDRESS|||",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "100263": {
+      "content": "|||IP_ADDRESS|||",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "100264": {
+      "content": "<|im_start|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "100265": {
+      "content": "<|im_end|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "100266": {
+      "content": "<|extra_id_1|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "100267": {
+      "content": "<|extra_id_2|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "100268": {
+      "content": "<|extra_id_3|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "100269": {
+      "content": "<|extra_id_4|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "100270": {
+      "content": "<|extra_id_5|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "100271": {
+      "content": "<|extra_id_6|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "100272": {
+      "content": "<|extra_id_7|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "100273": {
+      "content": "<|extra_id_8|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "100274": {
+      "content": "<|extra_id_9|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "100275": {
+      "content": "<|extra_id_10|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "100276": {
+      "content": "<|endofprompt|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "100277": {
+      "content": "<|pad|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "100278": {
+      "content": "<im_start>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "100279": {
+      "content": "<im_end>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "100280": {
+      "content": "<im_patch>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "100281": {
+      "content": "<im_col>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "100282": {
+      "content": "<|image|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    }
+  },
+  "additional_special_tokens": [
+    "<im_start>",
+    "<im_end>",
+    "<im_patch>",
+    "<im_col>",
+    "<|image|>"
+  ],
+  "auto_map": {
+    "AutoProcessor": "preprocessing_molmo.MolmoProcessor"
+  },
+  "bos_token": "<|endoftext|>",
+  "chat_template": "{% for message in messages -%}\n        {%- if (loop.index % 2 == 1 and message['role'] != 'user') or \n          (loop.index % 2 == 0 and message['role'].lower() != 'assistant') -%}\n        {{ raise_exception('Conversation roles must alternate user/assistant/user/assistant/...') }}\n        {%- endif -%}\n        {{ message['role'].capitalize() + ': ' + message['content'] }}\n        {%- if not loop.last -%}\n        {{ ' ' }}\n        {%- endif %}\n        {%- endfor -%}\n        {%- if add_generation_prompt -%}\n        {{ ' Assistant:' }}\n        {%- endif %}",
+  "clean_up_tokenization_spaces": false,
+  "eos_token": "<|endoftext|>",
+  "model_max_length": 8192,
+  "pad_token": "<|pad|>",
+  "processor_class": "MolmoProcessor",
+  "tokenizer_class": "GPT2Tokenizer",
+  "unk_token": "<|endoftext|>"
+}